Entry 1 sense Webster, 1913 Semitism /sĕm'-ĭt-ĭzˌ-əm/ · Sem·i·tism · IPA /ˈsɛmɪtɪzəm/ 01 n. A Semitic idiom; a word of Semitic origin. 1. A Semitic idiom; a word of Semitic origin.