treatyn.[OE. tretee, F. trait, LL. tractatus; cf. L. tractatus a handling, treatment, consultation, tractate. See Treat, and cf. Tractate.]1. The act of treating for the adjustment of differences, as for forming an agreement; negotiation.(Chaucer.)He cast by treaty and by trains
Her to persuade. (Spenser.)2. An agreement so made; specifically, an agreement, league, or contract between two or more nations or sovereigns, formally signed by commissioners properly authorized, and solemnly ratified by the several sovereigns, or the supreme power of each state; an agreement between two or more independent states; as, a treaty of peace; a treaty of alliance.()3. A proposal tending to an agreement.(Shak.)4. A treatise; a tract.(Sir T. Browne.)