/ Dictionary / Index I instr.: Meaning and Definition of Find definitions for: instr. Pronunciation: [key] instructor. instrument. instrumental. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. institutor instroke 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