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(Geological Science) geology the passage of a geological formation across time planes, as occurs when a marine sediment laid down by an advancing sea is noticeably younger in the direction of advancement
the comparative study of a development based on its history. — diachronic, diachronistic, diachronistical, adj.See also: Time
the study and description of the change or development in the structural systems of a language over a stated period of time. Also called historical linguistics. Cf. synchronic linguistics. — diachronic, adj.See also: Linguistics