SYN: Assist, abet, contribute, concur, work together, help, conspire.

ANT: Thwart, oppose, counteract, rival.

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KEY: Co-operation, [See CO-OPERATE and UNION].

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KEY: Co-ordinate.

SYN: Consociate, coincident, equal, coequal, equivalent, tantamount, equipollent, interequivalent.

ANT: Extraneous, diverse, alien, unequal, unequivalent, incoordinate, disparate.

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KEY: Copartner, [See PARTNER].