/ Dictionary / Index Y yesternoon: Meaning and Definition of Find definitions for: yes•ter•noon Pronunciation: (yes'tur-nn'), [key] — Archaic. Archaic. —n. yesterday noon. —adv. at noon yesterday. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. yesternight yesterweek Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language