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18 points
DIACHRONIC is validvalid
pertaining to diachrony [adj] : DIACHRONICALLY [adv]
of the study of a subject (esp. a language) through its historical development, as opposed to synchronic [adj DIACHRONICALLY]
pertaining to diachrony [adj] : DIACHRONICALLY [adv]
of the study of a subject (esp. a language) through its historical development, as opposed to synchronic [adj DIACHRONICALLY]