/ Dictionary / Index T triweekly: Meaning and Definition of Find definitions for: tri•week•ly Pronunciation: (trī-wēk'lē), [key] — adv., adj., n., pl. -lies. —adv. every three weeks. three times a week. —adj. occurring or appearing every three weeks. occurring or appearing three times a week. —n. a triweekly publication. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trivium -trix Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language