diachronic

/ˌdaɪəˈkrɑnɪk/
adjective
  1. Relating to the way something, especially a language, develops and changes over time.
    • Linguists use a diachronic approach to trace the origins of grammar rules.
    • The museum's exhibit took a diachronic view of fashion from the 1800s to today.
    • A diachronic study of English shows how words have shifted in meaning.
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