Relating to changes in a language or phenomenon over time, rather than at a single point in time.
From Greek 'dia-' (through/across) + 'chronos' (time), literally 'across time,' contrasting with 'synchronic' (at one time).
Diachronic analysis explains why English sounds so different from Old English—words slowly shift meaning and pronunciation like the Mississippi River gradually changing course, and you only notice by looking back centuries.
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