To join or unite together; to combine or link with something else as an equal partner.
From Old French 'cojoindre,' from Latin 'co-' (together) + 'jungere' (to join). This archaic verb preserves the prefix that gives us 'cooperate' and 'coexist.'
The 'co-' prefix is incredibly productive in English—we use it constantly today (co-author, co-star, co-signer) but this old verb shows the pattern is centuries old. Medieval writers would say 'cojoin' where we'd say 'join together.'
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