Atticism. Syllabification: At·ti·cism. Pronunciation: adəˌsizəm. noun: Atticism. plural noun: Atticisms. Definition: a word or form characteristic of Attic Greek. Origin: late 16th century: from Greek Attikismos, from Attikos (see Attic). From the original sense of ‘the Greek language as used by the Athenians,’ arose the meaning ‘refined, elegant Greek,’ later extended to language in general.