/ Dictionary / Index T TPA: Meaning and Definition of Find definitions for: TPA Pronunciation: [key] See tissue plasminogen activator. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tp. tpd Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language