From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( n.) Specifically, an amount in the public treasury at any time greater than is required for the ordinary purposes of the government.

(2): ( a.) Being or constituting a surplus; more than sufficient; as, surplus revenues; surplus population; surplus words.

(3): ( n.) That which remains when use or need is satisfied, or when a limit is reached; excess; overplus.

King James Dictionary [2]

Sur'Plus, n. L. id.,more.

1. Overplus that which remains when use is satisfied excess beyond what is prescribed or wanted. In the United States, the surplus of wheat and rye not required for consumption or exportation, is distilled. 2. In law, the residuum of an estate, after the debts and legacies are paid.