n. That which remains after a part is taken, separated, removed, or dealt with in some other way; what is left over; remainder; the rest.n. In law:n. The residuum of a testator's estate after payment of debts and legacies.n. That which remains of a testator's estate after payment of debts and particular legacies, and is undisposed of except it may be by a general clause or residuary legacy.n. In the theory of numbers, the remainder after division, especially after division by a fixed modulus; in the integral calculus, the integral of a monodromic function taken round a pole or poles: same as residual, 2.n. Synonyms Rest, etc. See remainder.