/ Dictionary / Index I inst.: Meaning and Definition of Find definitions for: inst. Pronunciation: [key] instant (def. 11). instantaneous. (usually cap.) institute. (usually cap.) institution. instructor. instrument. instrumental. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: inst (Thesaurus) inspissate instability Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language