Agreement

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late Middle English: from Old French, from agreer ‘make agreeable to’ (see agree).

wiktionary

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From Middle English agrement, agreement, from Old French agrement, agreement.

Morphologically agree +‎ -ment

etymonline

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agreement (n.)

c. 1400, "mutual understanding" (among persons), also (of things) "mutual conformity," from Old French agrement, agreement, noun of action from agreer "to please" (see agree). Early 15c. as "formal or documentary agreement, terms of settlement."