expansivity

from WordNet (r) 3.0 (2006)

expansivity
    n 1: the fractional change in length or area or volume per unit
         change in temperature at a given constant pressure [syn:
         {coefficient of expansion}, {expansivity}]
    2: a quality characterized by magnificence of scale or the
       tendency to expand; "the expansiveness of their extravagant
       life style was soon curtailed" [syn: {expansiveness},
       {expansivity}]
    3: a friendly open trait of a talkative person [syn:
       {effusiveness}, {expansiveness}, {expansivity}]

from The Collaborative International Dictionary of English v.0.48

expansivity \expansivity\ n.
   1. the fractional change in length or area or volume per unit
      change in temperature at a given constant pressure.

   Syn: coefficient of expansion.
        [WordNet 1.5]