WordWeb Online

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

Derived forms: expansivities

Type of: coefficient, communicativeness, grandness, impressiveness, magnificence, richness

Encyclopedia: Expansivity