Entry 1 sense Webster, 1913 Idio- /(ĭd"ĭ*ō̇-)/ · Id·i·o- · IPA /ˈɪdɪəʊ/ 01 A combining form from the Greek 'i`dios, meaning private, personal, peculiar, distinct. 1. A combining form from the Greek 'i`dios, meaning private, personal, peculiar, distinct.