Mutually friendly or pleasant; able to be friends together or get along well with one another.
From Latin co- (together) plus amiable (from Old French 'amiable', from Latin 'amicabilis' meaning friendly). The prefix transforms amiable from 'being friendly' to 'being friendly with each other.'
This word appears mostly in old philosophical texts about relationships and social harmony. It's almost extinct in modern English, but it captures something we still struggle with today—whether people can actually be coamiable, or if some personalities are simply incompatible.
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