/ Dictionary / Index T treachery: Meaning and Definition of Find definitions for: treach•er•y Pronunciation: (trech'u-rē), [key] — pl. -er•ies. violation of faith; betrayal of trust; treason. an act of perfidy, faithlessness, or treason. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: treachery (Thesaurus) treacherous treacle Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language