/ Dictionary / Index E expressivity: Meaning and Definition of Find definitions for: ex•pres•siv•i•ty Pronunciation: (ek"spre-siv'i-tē), [key] — n. the quality or state of being expressive. the degree to which a particular gene produces its effect in an organism. Cf. penetrance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. expressive express lane Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language