Definition of diachronic adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌdaɪəˈkrɒnɪk//
; NAmE NAmE//ˌdaɪəˈkrɑːnɪk//
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relating to the way something, especially a language, has developed over time compare synchronic Word Origin mid 19th cent.: from dia- ‘through’ + Greek khronos ‘time’ + -ic.
See the Oxford Advanced American Dictionary entry: diachronic