- -ism -ism [F. -isme, or L. -ismus, Gr. ?.] A suffix indicating an act, a process, the result of an act or a process, a state; also, a characteristic (as a theory, doctrine, idiom, etc.); as, baptism, galvanism, organism, hypnotism, socialism, sensualism, Anglicism. [1913 Webster]
The Collaborative International Dictionary of English. 2000.