| cosign | (verb) sign and endorse (another person's signature), as for a loan | Synonyms: co-sign |
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| (verb) sign jointly | Synonyms: co-sign |
| cosignatory | (adjective) signing jointly with others | - |
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| (noun) one of two or more signers of the same document (as a treaty or declaration) | Synonyms: cosigner |
| cosigner | (noun) one of two or more signers of the same document (as a treaty or declaration) | Synonyms: cosignatory |
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| (noun) a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety) | - |
| cosily | (adverb) in a cozy manner | Synonyms: cozily |
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| cosine | (noun) ratio of the adjacent side to the hypotenuse of a right-angled triangle | Synonyms: cos |
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| cosiness | (noun) a state of warm snug comfort | Synonyms: coziness, snugness |
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