Word-Build World: diachrony November 11, 2023 Mike Zonta Leave a comment A.Word.A.Daywith Anu Garg diachrony PRONUNCIATION: (dy-AK-ruh-nee) MEANING: noun: Change occurring over a period of time. ETYMOLOGY: From Greek dia- (through) + chronos (time). Earliest documented use: 1939. Contrasted with synchrony.