diachronic
adjective/ˌdaɪəˈkrɒnɪk/
/ˌdaɪəˈkrɑːnɪk/
(specialist)- relating to the way something, especially a language, has developed over time compare synchronicWord Originmid 19th cent.: from dia- ‘through’ + Greek khronos ‘time’ + -ic.
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diachronic