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periodic
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English Dictionary: periodic by the DICT Development Group
3 results for periodic
From WordNet (r) 3.0 (2006) [wn]:
periodic
adj
  1. happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust"
    Synonym(s): periodic, periodical
    Antonym(s): aperiodic, nonperiodic
  2. recurring or reappearing from time to time; "periodic feelings of anxiety"
    Synonym(s): periodic, occasional
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Periodic \Per`i*od"ic\, a. [Pref. per- + iodic.] (Chem.)
      Pertaining to, derived from, or designating, the highest
      oxygen acid (HIO[?]) of iodine.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Periodic \Pe`ri*od"ic\, Periodical \Pe`ri*od"ic*al\, a. [L.
      periodicus, Gr. [?]: cf. F. p[82]riodique.]
      1. Of or pertaining to a period or periods, or to division by
            periods.
  
                     The periodicaltimes of all the satellites. --Sir J.
                                                                              Herschel.
  
      2. Performed in a period, or regular revolution; proceeding
            in a series of successive circuits; as, the periodical
            motion of the planets round the sun.
  
      3. Happening, by revolution, at a stated time; returning
            regularly, after a certain period of time; acting,
            happening, or appearing, at fixed intervals; recurring;
            as, periodical epidemics.
  
                     The periodic return of a plant's flowering.
                                                                              --Henslow.
  
                     To influence opinion through the periodical press.
                                                                              --Courthope.
  
      4. (Rhet.) Of or pertaining to a period; constituting a
            complete sentence.
  
      {Periodic comet} (Astron.), a comet that moves about the sun
            in an elliptic orbit; a comet that has been seen at two of
            its approaches to the sun.
  
      {Periodic function} (Math.), a function whose values recur at
            fixed intervals as the variable uniformly increases. The
            trigonomertic functions, as sin x, tan x, etc., are
            periodic functions. Exponential functions are also
            periodic, having an imaginary period, and the elliptic
            functions have not only a real but an imaginary period,
            and are hence called doubly periodic.
  
      {Periodic law} (Chem.), the generalization that the
            properties of the chemical elements are periodic functions
            of their atomic wieghts. [bd]In other words, if the
            elements are grouped in the order of their atomic weights,
            it will be found that nearly the same properties recur
            periodically throughout the entire series.[b8] The
            following tabular arrangement of the atomic weights shows
            the regular recurrence of groups (under I., II., III.,
            IV., etc.), each consisting of members of the same natural
            family. The gaps in the table indicate the probable
            existence of unknown elements.
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