/ Dictionary / Index F foison: Meaning and Definition of Find definitions for: foi•son Pronunciation: (foi'zun), [key] — n. Archaic. abundance; plenty. abundant harvest. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Foïsm foist Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language