In a manner that examines or considers changes across time; from a historical, timeline perspective.
From 'diachronic' + '-ally' (adverb suffix), meaning 'in a diachronic way or manner.'
Studying English diachronically reveals that 'nice' once meant 'stupid,' 'silly' meant 'blessed,' and 'awful' meant 'awesome'—words are time travelers from meaning-alien universes.
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