diachronic

adjective

dia·​chron·​ic ˌdī-ə-ˈkrä-nik 

: of, relating to, or dealing with phenomena (as of language or culture) as they occur or change over a period of time

diachronically

ˌdī-ə-ˈkrä-ni-k(ə-)lē 

adverb

Word History

Etymology

borrowed from French diachronique, from diachronie diachrony + -ique -ic entry 1

First Known Use

1922, in the meaning defined above