FOISON Meaning of FOISON in English /foy"zeuhn/ , n. Archaic.1. abundance; plenty. 2. abundant harvest. [ 1250-1300; ME foisoun foison fusion- (s. of fusio ) an outpouring. See FUSION ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012