a construction in which an expected grammatical agreement in form is replaced by an agreement in meaning, as in The crowd rose to their feet, where a plural pronoun is used to refer to a singular noun.
Origin: 1890–95; < NL < Gk sýnesis understanding, intelligence, equiv. to syn-syn-+ (h)e- (s. of hiénai to throw, send) + -sis-sis
[sin-uh-sis] 
ə