diachronic
Linguistics term referring to the study of language change over time. Often contrasted with 共時的 (synchronic).
See also: 共時的
Analyze language change from a diachronic perspective.
This research adopts a diachronic approach.
From 通時 (diachrony) + 的 (-like, adjectival suffix). 通時 is composed of 通 (pass through, over time) and 時 (time).