Amendment

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Middle English (in the sense ‘improvement, correction’): from Old French amendement, from amender (see amend).

wiktionary

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From French amendement, from Late Latin amendamentum.

etymonline

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amendment (n.)

early 13c., "betterment, improvement;" c. 1300, of persons, "correction, reformation," from Old French amendement "rectification, correction; advancement, improvement," from amender (see amend). Sense expanded to include "correction of error in a legal process" (c. 1600) and "alteration of a writ or bill" to remove its faults (1690s).