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English Dictionary: Expansion by the DICT Development Group
2 results for Expansion
From WordNet (r) 3.0 (2006) [wn]:
  1. the act of increasing (something) in size or volume or quantity or scope
    Synonym(s): expansion, enlargement
    Antonym(s): contraction
  2. a function expressed as a sum or product of terms; "the expansion of (a+b)^2 is a^2 + 2ab + b^2"
  3. a discussion that provides additional information
    Synonym(s): expansion, enlargement, elaboration
  4. adding information or detail
    Synonym(s): expansion, expanding upon
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Expansion \Ex*pan"sion\, n. [L. expansio: cf. F. expansion.]
      1. The act of expanding or spreading out; the condition of
            being expanded; dilation; enlargement.
      2. That which is expanded; expanse; extend surface; as, the
            expansion of a sheet or of a lake; the expansion was
            formed of metal.
                     The starred expansion of the skies.   --Beattie.
      3. Space through which anything is expanded; also, pure
                     Lost in expansion, void and infinite. --Blackmore.
      4. (Com.) Enlargement or extension of business transactions;
            esp., increase of the circulation of bank notes.
      5. (Math.) The developed result of an indicated operation;
            as, the expansion of (a + b)^{2} is a^{2} + 2ab + b^{2}.
      6. (Steam Engine) The operation of steam in a cylinder after
            its communication with the boiler has been cut off, by
            which it continues to exert pressure upon the moving
      7. (Nav. Arch.) The enlargement of the ship mathematically
            from a model or drawing to the full or building size, in
            the process of construction. --Ham. Nav. Encyc.
      Note: Expansion is also used adjectively, as in expansion
               joint, expansion gear, etc.
      {Expansion curve}, a curve the co[94]rdinates of which show
            the relation between the pressure and volume of expanding
            gas or vapor; esp. (Steam engine), that part of an
            indicator diagram which shows the declining pressure of
            the steam as it expands in the cylinder.
      {Expansion gear} (Steam Engine). a cut-off gear. See Illust.
            of {Link motion}.
      {Automatic expansion gear} [or] {cut-off}, one that is
            regulated by the governor, and varies the supply of steam
            to the engine with the demand for power.
      {Fixed expansion gear}, [or] {Fixed cut-off}, one that always
            operates at the same fixed point of the stroke.
      {Expansion joint}, [or] {Expansion coupling} (Mech. &
            Engin.), a yielding joint or coupling for so uniting parts
            of a machine or structure that expansion, as by heat, is
            prevented from causing injurious strains; as by heat, is
            prevented from causing injurious strains; as:
            (a) A side or set of rollers, at the end of bridge truss,
                  to support it but allow end play.
            (b) A telescopic joint in a steam pipe, to permit one part
                  of the pipe to slide within the other.
            (c) A clamp for holding a locomotive frame to the boiler
                  while allowing lengthwise motion.
      {Expansion valve} (Steam Engine), a cut-off valve, to shut
            off steam from the cylinder before the end of each stroke.
No guarantee of accuracy or completeness!
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