To agree is to have the same opinion as someone else or to accept a decision or plan. It can also mean that things match or fit together well.
From Old French *agreer* “to please, be acceptable,” from *à gré* “to one’s liking.” The sense moved from “it pleases” to “we are of one mind about it.”
Hidden inside *agree* is the idea of ‘pleasing’—if we agree, the situation is pleasing to both of us. That’s why agreement often feels like social harmony, not just logical matching of opinions.
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