/ Dictionary / Index Y yesterweek: Meaning and Definition of Find definitions for: yes•ter•week Pronunciation: (yes'tur-wēk'), [key] — Archaic. Archaic. —n. last week. —adv. during last week. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. yesternoon yesteryear 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