/ Dictionary / Index T TSR: Meaning and Definition of Find definitions for: TSR Pronunciation: [key] — pl. TSRs, TSR's. a computer program with any of several ancillary functions, usu. held resident in RAM for instant activation while one is using another program. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. T square TSS Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language