diachronic

形容词 diachronic:

1. used of the study of a phenomenon (especially language) as it changes through time
   同义词：historical

di.a.chron.ic

adj.（形容词）
Of or concerned with phenomena, especially of language, as they change through time.
历时的：现象的或涉及现象的，尤指语言随时间推移而发生变化的情况

来源：
From dia-
源自 dia-
Greek khronos [time]
希腊语 khronos [时间]

【引伸】
di.achron.ically
adv.（副词）