Sy̆n'al-lag-măt'ic, a.

a. [Fr. synallagmatique, It. sinallagmatico, Gr. συναλλαγματικός, from συνάλλαγμα, a mutual agreement, contract, from συναλλάσσειν, to exchange, negotiate with, from σύν, with, and ἀλλάσσειν, to change.] (Law.) Imposing reciprocal obligations upon the parties; as, a synallagmatic contract. Bouvier.