/ Dictionary / Index T tenon: Meaning and Definition of Find definitions for: ten•on Pronunciation: (ten'un), [key] — n. a projection formed on the end of a timber or the like for insertion into a mortise of the same dimensions. See illus. under —v.t. to provide with a tenon. to join by or as by a tenon. to join securely. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tenon (Thesaurus) Tenochtitlán tenonitis Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language