occasion
         n 1: an event that occurs at a critical time; "at such junctures
               he always had an impulse to leave"; "it was needed only on
               special occasions" [syn: {juncture}, {occasion}]
         2: a vaguely specified social event; "the party was quite an
            affair"; "an occasion arranged to honor the president"; "a
            seemingly endless round of social functions" [syn: {affair},
            {occasion}, {social occasion}, {function}, {social function}]
         3: reason; "there was no occasion for complaint"
         4: the time of a particular event; "on the occasion of his 60th
            birthday"
         5: an opportunity to do something; "there was never an occasion
            for her to demonstrate her skill"
         v 1: give occasion to

English Dictionary: occasionally	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
occasional adj occurring from time to time; "took an occasional glass of wine" occurring or appearing at usually irregular intervals; "episodic in his affections"; "occasional headaches" Synonym(s): episodic, occasional occurring from time to time; "casual employment"; "a casual correspondence with a former teacher"; "an occasional worker" Synonym(s): casual, occasional recurring or reappearing from time to time; "periodic feelings of anxiety" Synonym(s): periodic, occasional
From WordNet (r) 3.0 (2006) [wn]:
occasionally adv now and then or here and there; "he was arrogant and occasionally callous"; "open areas are only occasionally interrupted by clumps of trees"; "they visit New York on occasion"; "now and again she would take her favorite book from the shelf and read to us"; "as we drove along, the beautiful scenery now and then attracted his attention" Synonym(s): occasionally, on occasion, once in a while, now and then, now and again, at times, from time to time
From WordNet (r) 3.0 (2006) [wn]:
occasions n something you have to do; "he minded his own specialized occasions"
From WordNet (r) 3.0 (2006) [wn]:
os sesamoideum n any of several small round bones formed in a tendon where it passes over a joint Synonym(s): sesamoid bone, sesamoid, os sesamoideum
From WordNet (r) 3.0 (2006) [wn]:
os zygomaticum n the arch of bone beneath the eye that forms the prominence of the cheek Synonym(s): cheekbone, zygomatic bone, zygomatic, malar, malar bone, jugal bone, os zygomaticum
From WordNet (r) 3.0 (2006) [wn]:
oxygen n a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust Synonym(s): oxygen, O, atomic number 8
From WordNet (r) 3.0 (2006) [wn]:
oxygen acid n any acid that contains oxygen [syn: oxyacid, {oxygen acid}]
From WordNet (r) 3.0 (2006) [wn]:
oxygen debt n a cumulative deficit of oxygen resulting from intense exercise; the deficit must be made up when the body returns to rest
From WordNet (r) 3.0 (2006) [wn]:
oxygen deficit n temporary oxygen shortage in cells resulting from strenuous exercise
From WordNet (r) 3.0 (2006) [wn]:
oxygen mask n a breathing device that is placed over the mouth and nose; supplies oxygen from an attached storage tank
From WordNet (r) 3.0 (2006) [wn]:
oxygenase n an oxidoreductase that catalyzes the incorporation of molecular oxygen
From WordNet (r) 3.0 (2006) [wn]:
oxygenate v impregnate, combine, or supply with oxygen; "oxygenate blood" Synonym(s): oxygenate, oxygenize, oxygenise, aerate
From WordNet (r) 3.0 (2006) [wn]:
oxygenation n the process of providing or combining or treating with oxygen; "the oxygenation of the blood"
From WordNet (r) 3.0 (2006) [wn]:
oxygenise v change (a compound) by increasing the proportion of the electronegative part; or change (an element or ion) from a lower to a higher positive valence: remove one or more electrons from (an atom, ion, or molecule) Synonym(s): oxygenize, oxygenise dehydrogenate with oxygen Synonym(s): oxygenize, oxygenise impregnate, combine, or supply with oxygen; "oxygenate blood" Synonym(s): oxygenate, oxygenize, oxygenise, aerate
From WordNet (r) 3.0 (2006) [wn]:
oxygenize v change (a compound) by increasing the proportion of the electronegative part; or change (an element or ion) from a lower to a higher positive valence: remove one or more electrons from (an atom, ion, or molecule) Synonym(s): oxygenize, oxygenise dehydrogenate with oxygen Synonym(s): oxygenize, oxygenise impregnate, combine, or supply with oxygen; "oxygenate blood" Synonym(s): oxygenate, oxygenize, oxygenise, aerate
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasion \Oc*ca"sion\ ([ocr]k*k[amac]"zh[ucr]n), n. [F.       occasion, L. occasio, fr. occidere, occasum, to fall down; ob       (see {Ob-}) + cadere to fall. See {Chance}, and cf.       {Occident}.]       1. A falling out, happening, or coming to pass; hence, that             which falls out or happens; occurrence; incident.                         The unlooked-for incidents of family history, and                      its hidden excitements, and its arduous occasions.                                                                               --I. Taylor.          2. A favorable opportunity; a convenient or timely chance;             convenience.                         Sin, taking occasion by the commandment, deceived                      me.                                                   --Rom. vii.                                                                               11.                         I'll take the occasion which he gives to bring Him                      to his death.                                    --Waller.          3. An occurrence or condition of affairs which brings with it             some unlooked-for event; that which incidentally brings to             pass an event, without being its efficient cause or             sufficient reason; accidental or incidental cause.                         Her beauty was the occasion of the war. --Dryden.          4. Need; exigency; requirement; necessity; as, I have no             occasion for firearms.                         After we have served ourselves and our own                      occasions.                                          --Jer. Taylor.                         When my occasions took me into France. --Burke.          5. A reason or excuse; a motive; a persuasion.                         Whose manner was, all passengers to stay, And                      entertain with her occasions sly.      --Spenser.          {On occasion}, in case of need; in necessity; as convenience             requires; occasionally. [bd]That we might have             intelligence from him on occasion,[b8] --De Foe.          Syn: Need; incident; use. See {Opportunity}.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasion \Oc*ca"sion\ ([ocr]k*k[amac]"zh[ucr]n), v. t. [imp. &       p. p. {Occasioned} (-zh[ucr]nd); p. pr. & vb. n.       {Occasioning}.] [Cf.F. occasionner.]       To give occasion to; to cause; to produce; to induce; as, to       occasion anxiety. --South.                   If we inquire what it is that occasions men to make                several combinations of simple ideas into distinct                modes.                                                   --Locke.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasionable \Oc*ca"sion*a*ble\, a.       Capable of being occasioned or caused. --Barrow.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasional \Oc*ca"sion*al\, a. [Cf.F. occasionnel.]       1. Of or pertaining to an occasion or to occasions; occuring             at times, but not constant, regular, or systematic; made             or happening as opportunity requires or admits; casual;             incidental; as, occasional remarks, or efforts.                         The . . . occasional writing of the present times.                                                                               --Bagehot.          2. Produced by accident; as, the occasional origin of a             thing. [Obs.] --Sir T. Browne.          {Occasional cause} (Metaph.), some circumstance preceding an             effect which, without being the real cause, becomes the             occasion of the action of the efficient cause; thus, the             act of touching gunpowder with fire is the occasional, but             not the efficient, cause of an explosion.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasional \Oc*ca"sion*al\, a. [Cf.F. occasionnel.]       1. Of or pertaining to an occasion or to occasions; occuring             at times, but not constant, regular, or systematic; made             or happening as opportunity requires or admits; casual;             incidental; as, occasional remarks, or efforts.                         The . . . occasional writing of the present times.                                                                               --Bagehot.          2. Produced by accident; as, the occasional origin of a             thing. [Obs.] --Sir T. Browne.          {Occasional cause} (Metaph.), some circumstance preceding an             effect which, without being the real cause, becomes the             occasion of the action of the efficient cause; thus, the             act of touching gunpowder with fire is the occasional, but             not the efficient, cause of an explosion.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasionalism \Oc*ca"sion*al*ism\, n. (Metaph.)       The system of occasional causes; -- a name given to certain       theories of the Cartesian school of philosophers, as to the       intervention of the First Cause, by which they account for       the apparent reciprocal action of the soul and the body.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasionality \Oc*ca`sion*al"i*ty\, n.       Quality or state of being occasional; occasional occurrence.       [R.]
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasionally \Oc*ca"sion*al*ly\, adv.       In an occasional manner; on occasion; at times, as       convenience requires or opportunity offers; not regularly.       --Stewart.                   The one, Wolsey, directly his subject by birth; the                other, his subject occasionally by his preferment.                                                                               --Fuller.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasionate \Oc*ca"sion*ate\, v. t.       To occasion. [Obs.]                   The lowest may occasionate much ill.      --Dr. H. More.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasion \Oc*ca"sion\ ([ocr]k*k[amac]"zh[ucr]n), v. t. [imp. &       p. p. {Occasioned} (-zh[ucr]nd); p. pr. & vb. n.       {Occasioning}.] [Cf.F. occasionner.]       To give occasion to; to cause; to produce; to induce; as, to       occasion anxiety. --South.                   If we inquire what it is that occasions men to make                several combinations of simple ideas into distinct                modes.                                                   --Locke.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasioner \Oc*ca"sion*er\, n.       One who, or that which, occasions, causes, or produces. --Bp.       Sanderson.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occasion \Oc*ca"sion\ ([ocr]k*k[amac]"zh[ucr]n), v. t. [imp. &       p. p. {Occasioned} (-zh[ucr]nd); p. pr. & vb. n.       {Occasioning}.] [Cf.F. occasionner.]       To give occasion to; to cause; to produce; to induce; as, to       occasion anxiety. --South.                   If we inquire what it is that occasions men to make                several combinations of simple ideas into distinct                modes.                                                   --Locke.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Occision \Oc*ci"sion\, n. [L. occisio, fr. occidere, occisium,       to cut down, to kill; ob (see {Ob-}) + caedere to cut.]       A killing; the act of killing. [Obs.] --Sir M. Hale.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Ogygian \O*gyg"i*an\, a. [L. Ogygius, Gr. [?].]       Of or pertaining to Ogyges, a mythical king of ancient       Attica, or to a great deluge in Attica in his days; hence,       primeval; of obscure antiquity.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxycymene \Ox`y*cy"mene\, n. [Oxy       (b) + cymene.] (Chem.) Hydroxy cymene. Same as {Carvacrol}.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygen \Ox"y*gen\, n. [F. oxyg[8a]ne, from Gr. [?][?][?][?]       sharp, acid + root of [?][?][?][?] to be born. So called       because originally supposed to be an essential part of every       acid.]       1. (Chem.) A colorless, tasteless, odorless, gaseous element             occurring in the free state in the atmosphere, of which it             forms about 23 per cent by weight and about 21 per cent by             volume, being slightly heavier than nitrogen. Symbol O.             Atomic weight 15.96.          Note: It occurs combined in immense quantities, forming eight                ninths by weight of water, and probably one half by                weight of the entire solid crust of the globe, being an                ingredient of silica, the silicates, sulphates,                carbonates, nitrates, etc. Oxygen combines with all                elements (except fluorine), forming oxides, bases,                oxyacid anhydrides, etc., the process in general being                called oxidation, of which combustion is only an                intense modification. At ordinary temperatures with                most substances it is moderately active, but at higher                temperatures it is one of the most violent and powerful                chemical agents known. It is indispensable in                respiration, and in general is the most universally                active and efficient element. It may be prepared in the                pure state by heating potassium chlorate. This element                (called dephlogisticated air by Priestley) was named                oxygen by Lavoisier because he supposed it to be a                constituent of all acids. This is not so in the case of                a very few acids (as hydrochloric, hydrobromic, hydric                sulphide, etc.), but these do contain elements                analogous to oxygen in property and action. Moreover,                the fact that most elements approach the nearer to acid                qualities in proportion as they are combined with more                oxygen, shows the great accuracy and breadth of                Lavoisier's conception of its nature.          2. Chlorine used in bleaching. [Manufacturing name]
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Acid \Ac"id\, n.       1. A sour substance.          2. (Chem.) One of a class of compounds, generally but not             always distinguished by their sour taste, solubility in             water, and reddening of vegetable blue or violet colors.             They are also characterized by the power of destroying the             distinctive properties of alkalies or bases, combining             with them to form salts, at the same time losing their own             peculiar properties. They all contain hydrogen, united             with a more negative element or radical, either alone, or             more generally with oxygen, and take their names from this             negative element or radical. Those which contain no oxygen             are sometimes called {hydracids} in distinction from the             others which are called {oxygen acids} or {oxacids}.          Note: In certain cases, sulphur, selenium, or tellurium may                take the place of oxygen, and the corresponding                compounds are called respectively {sulphur acids} or                {sulphacids}, {selenium acids}, or {tellurium acids}.                When the hydrogen of an acid is replaced by a positive                element or radical, a salt is formed, and hence acids                are sometimes named as salts of hydrogen; as hydrogen                nitrate for nitric acid, hydrogen sulphate for                sulphuric acid, etc. In the old chemistry the name acid                was applied to the oxides of the negative or                nonmetallic elements, now sometimes called anhydrides.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenate \Ox"y*gen*ate\, v. t. [imp. & p. p. {Oxygenated}; p.       pr. & vb. n. {Oxygenating}.] [Cf. F. oxyg[82]ner.] (Chem.)       To unite, or cause to combine, with oxygen; to treat with       oxygen; to oxidize; as, oxygenated water (hydrogen dioxide).
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenate \Ox"y*gen*ate\, v. t. [imp. & p. p. {Oxygenated}; p.       pr. & vb. n. {Oxygenating}.] [Cf. F. oxyg[82]ner.] (Chem.)       To unite, or cause to combine, with oxygen; to treat with       oxygen; to oxidize; as, oxygenated water (hydrogen dioxide).
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Note: Although a gas, hydrogen is chemically similar to the                metals in its nature, having the properties of a weak                base. It is, in all acids, the base which is replaced                by metals and basic radicals to form salts. Like all                other gases, it is condensed by great cold and pressure                to a liquid which freezes and solidifies by its own                evaporation. It is absorbed in large quantities by                certain metals (esp. palladium), forming alloy-like                compounds; hence, in view of quasi-metallic nature, it                is sometimes called {hydrogenium}. It is the typical                reducing agent, as opposed to oxidizers, as oxygen,                chlorine, etc.          {Bicarbureted hydrogen}, an old name for ethylene.          {Carbureted hydrogen gas}. See under {Carbureted}.          {Hydrogen dioxide}, a thick, colorless liquid, {H2O2},             resembling water, but having a bitter, sour taste,             produced by the action of acids on barium peroxide. It             decomposes into water and oxygen, and is manufactured in             large quantities for an oxidizing and bleaching agent.             Called also {oxygenated water}.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenate \Ox"y*gen*ate\, v. t. [imp. & p. p. {Oxygenated}; p.       pr. & vb. n. {Oxygenating}.] [Cf. F. oxyg[82]ner.] (Chem.)       To unite, or cause to combine, with oxygen; to treat with       oxygen; to oxidize; as, oxygenated water (hydrogen dioxide).
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenation \Ox`y*gen*a"tion\, n. [Cf. F. oxyg[82]nation.]       (Chem.)       The act or process of combining or of treating with oxygen;       oxidation.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxidator \Ox"i*da`tor\, n.       1. An oxidizer. [Obs.]          2. A contrivance for causing a current of air to impinge on             the flame of the Argand lamp; -- called also {oxygenator}.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenator \Ox"y*gen*a`tor\, n.       An oxidizer.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxidator \Ox"i*da`tor\, n.       1. An oxidizer. [Obs.]          2. A contrivance for causing a current of air to impinge on             the flame of the Argand lamp; -- called also {oxygenator}.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenator \Ox"y*gen*a`tor\, n.       An oxidizer.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenic \Ox`y*gen"ic\, a. (Chem.)       Pertaining to, containing, or resembling, oxygen; producing       oxygen.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenizable \Ox"y*gen*i"za*ble\, a. (Chem.)       Oxidizable.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenize \Ox"y*gen*ize\, v. t. [imp. & p. p. {Oxygenized}; p       pr. & vb. n. {Oxygenizing}.] (Chem.)       To oxidize.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenize \Ox"y*gen*ize\, v. t. [imp. & p. p. {Oxygenized}; p       pr. & vb. n. {Oxygenizing}.] (Chem.)       To oxidize.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenizement \Ox"y*gen*ize`ment\, n.       Oxidation.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenize \Ox"y*gen*ize\, v. t. [imp. & p. p. {Oxygenized}; p       pr. & vb. n. {Oxygenizing}.] (Chem.)       To oxidize.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygenous \Ox*yg"e*nous\, a.       Oxygenic.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygon \Ox"y*gon\, n. [Gr. [?][?][?][?] sharp + [?][?][?] an       angle: cf.F. oxygone.] (Geom.)       A triangle having three acute angles.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygonal \Ox*yg"o*nal\, Oxygonial \Ox`y*go"ni*al\, a.       Having acute angles. --Barlow.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxygonal \Ox*yg"o*nal\, Oxygonial \Ox`y*go"ni*al\, a.       Having acute angles. --Barlow.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Oxyquinoline \Ox`y*quin"o*line\, n. [Oxy       (b) + quinoline.] (Chem.) Hydroxy quinoline; a phenol             derivative of quinoline, -- called also {carbostyril}.
From U.S. Gazetteer (1990) [gazetteer]:
Occoquan, VA (town, FIPS 58696)       Location: 38.68243 N, 77.26050 W       Population (1990): 361 (238 housing units)       Area: 0.4 sq km (land), 0.0 sq km (water)
From The Elements (22Oct97) [elements]:
oxygen    Symbol: O    Atomic number: 8    Atomic weight: 15.9994    A colourless, odourless gaseous element belonging to group 16 of the    periodic table. It is the most abundant element present in the earth's    crust. It also makes up 20.8% of the Earth's atmosphere. For industrial    purposes, it is separated from liquid air by fractional distillation. It    is used in high temperature welding, and in breathing. It commonly comes    in the form of Oxygen, but is found as Ozone in the upper atmosphere. It    was discovered by Priestley in 1774.