Transformation

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late Middle English: from Old French, or from late Latin transformatio(n- ), from the verb transformare (see transform).

wiktionary

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Borrowed from Middle French, from Ecclesiastical Latin trānsfōrmātiō. Morphologically transform +‎ -ation

etymonline

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transformation (n.)

c. 1400, from Old French transformation and directly from Church Latin transformationem (nominative transformatio) "change of shape," noun of action from past-participle stem of transformare "change in shape, metamorphose" (see transform).