/ Dictionary / Index I instrumentality: Meaning and Definition of Find definitions for: in•stru•men•tal•i•ty Pronunciation: (in"stru-men-tal'i-tē), [key] — pl. -ties the quality or state of being instrumental. the fact or function of serving some purpose. a means or agency. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: instrumentality (Thesaurus) instrumentalist instrumentation Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language