A relationship of mutual brotherhood or fellowship; the state of being compatriots or spiritual brothers.
From Latin com- 'together' + paternus 'of a father' + -ity suffix. It parallels 'fraternity' but emphasizes the 'com-' or shared aspect more explicitly.
Though rarely used, 'compaternity' captures something that modern words miss—it's specifically about chosen brotherhood rather than inherited family bonds, the kind of deep friendship medieval guilds and religious orders formalized in their rituals.
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