/ Dictionary / Index Y yester: Meaning and Definition of Find definitions for: yes•ter Pronunciation: (yes'tur), [key] — adj. Archaic. of or pertaining to yesterday. yester- Pronunciation: [key] a combining form, now unproductive, occurring in words that denote an extent of time one period prior to the present period, the nature of the period being specified by the second element of the compound: yesterweek. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. yes-no question yesterday Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language