I. id·i·o·tism ˈi-dē-ə-ˌti-zəm noun
Etymology: Middle French idiotisme, from Latin idiotismus common speech, from Greek idiōtismos, from idiōtēs
Date: 1588
1. obsolete : idiom 1
2. : idiom 2
II. id·i·ot·ism ˈi-dē-ə-(ˌ)ti-zəm noun
Etymology: idiot + -ism
Date: 1592
archaic : idiocy 2