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diachrony

[dahy-ak-ruh-nee]
noun, plural di·ach·ro·nies.
  1. Linguistics.
    1. a diachronic approach to language study.
    2. change or development in a linguistic system over a period of time.
  2. historical change.
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Origin of diachrony

First recorded in 1955–60; diachron(ic) + -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018