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First recorded in 1535–45; from Latin ���Ǿ��پ�ō��- (stem of ���Ǿ��پ�ō ) “a coming together,” equivalent to coi-, variant stem of ����ī���� “to come together” ( co- “together, with” + ī���� “to go”) + -�پ�ō��- noun suffix; co-, -tion