CCQ-1991 - Civil Code of Québec

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1380. A contract is synallagmatic, or bilateral, when the parties obligate themselves reciprocally, each to the other, so that the obligation of one party is correlative to the obligation of the other.
When one party obligates himself to the other without any obligation on the part of the latter, the contract is unilateral.
1991, c. 64, a. 1380.