'expansivity' definitions:

Definition of 'expansivity'

From: WordNet
noun
The fractional change in length or area or volume per unit change in temperature at a given constant pressure [syn: coefficient of expansion, expansivity]
noun
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]
noun
A friendly open trait of a talkative person [syn: effusiveness, expansiveness, expansivity]

Definition of 'expansivity'

From: GCIDE
  • 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]