diachronic
adjective uk/ˌdaɪ.əˈkrɒn.ɪk/ us/ˌdaɪ.əˈkrɑː.nɪk/
（尤指语言）历经时间长河的，历时的
relating to the changes in something, especially a language, that happen over time
Synonym: historical
Compare: synchronic
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