/ Dictionary / Index P PTT: Meaning and Definition of Find definitions for: PTT Pronunciation: [key] Post, Telegraph, and Telephone (the government-operated system, as in France or Turkey). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. PTSD ptui Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language