a. [ad. Gr. συναλλαγματικός, f. συνάλλαγμα covenant, contract, f. συναλλάσσειν (see prec.).] Pertaining to or of the nature of a contract or mutual engagement; imposing mutual obligations; reciprocally binding: esp. in Civil Law, of a treaty or the like.
1792. Ann. Reg., St. Papers, 251/1. These cessions … which are synallagmatic acts,… being infringed by the usurping assembly, would be at present annulled.
1818. Colebrooke, Obligations, 16. Mutual or synallagmatic contracts are either perfectly or imperfectly reciprocal.
1875. Poste, Gaius, III. Comm. (ed. 2), 362. The several proffered and accepted promises are called a Bilateral or Synallagmatic Convention.
1898. 19th Cent., Feb., 234. A synallagmatic contract between two States.
So Synallagmatical a. in same sense; hence Synallagmatically adv.
1871. Daily News, 20 April, 5. Armistice and ‘synallagmatical’ amnesty…. When these terms are mutually—I beg pardon—synallagmatically accepted, then we are told that the peace will be without conquerors and without conquered.
