n. That which remains when use or need is satisfied, or when a limit is reached; excess; overplus.n. Specifically, an amount in the public treasury at any time greater than is required for the ordinary purposes of the government.n. The remainder of a fund appropriated for a particular purpose.n. assets left after liabilities and debts, including capital stock have been deducted.adj. Being or constituting a surplus; more than sufficient; as, surplus revenues; surplus population; surplus words.