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agree [agree 词源字典]: agree: [14] Originally, if a thing ‘agreed you’, it was to your liking, it pleased you. This early meaning survives in the adjective agreeable [14], but the verb has meanwhile moved on via ‘to reconcile (people who have quarrelled)’ and ‘to come into accord’ to its commonest presentday sense, ‘to concur’. It comes from Old French agréer ‘to please’, which was based on the phrase a gré ‘to one’s liking’. Gré was descended from Latin grātum, a noun based on grātus ‘pleasing’, from which English also gets grace and grateful.
=> congratulate, grace, grateful, gratitude[agree etymology, agree origin, 英语词源]
agree (v.): late 14c., "to be to one's liking;" also "to give consent," from Old French agreer "to receive with favor, take pleasure in" (12c.), from phrase a gré "favorably, of good will," literally "to (one's) liking," from Latin ad "to" (see ad-) + gratum "pleasing," neuter of gratus (see grace (n.)); the original sense survives best in agreeable. Meaning "to be in harmony in opinions" is from late 15c. Related: Agreed; agreeing.
agreeable (adj.): late 14c., "to one's liking," from Old French agreable (12c., Modern French agréable) "pleasing, in agreement, consenting, thankful," from agreer "to please" (see agree). Related: Agreeably. To do the agreeable (1825) was to "act in a courteous manner."
agreeance (n.): 1530s, from Middle French agréance, noun of action from agréer (see agree).
agreement (n.): c. 1400, "mutual understanding" (among persons), also (of things) "mutual conformity," from Old French agrement, noun of action from agreer "to please" (see agree).
disagree (v.): late 15c., "refuse to assent," from Old French desagreer (12c.), from des- (see dis-) + agreer (see agree). Related: Disagreed; disagreeing.