/ Dictionary / Index F fluidity: Meaning and Definition of Find definitions for: flu•id•i•ty Pronunciation: (fl-id'i-tē), [key] — n. the quality or state of being fluid. the ability of a substance to flow. a measure of this ability, the reciprocal of the coefficient of viscosity. Cf. rhe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fluidity (Thesaurus) fluidics fluidize Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language