supplementn.[F. supplment, L. supplementum, fr. supplere to fill up. See Supply, v. t.]1. That which supplies a deficiency, or meets a want; a store; a supply.(Chapman.)2. That which fills up, completes, or makes an addition to, something already organized, arranged, or set apart; specifically, a part added to, or issued as a continuation of, a book or paper, to make good its deficiencies or correct its errors.()3. (Trig.) The number of degrees which, if added to a specified arc, make it 180; the quantity by which an arc or an angle falls short of 180 degrees, or an arc falls short of a semicircle.()()v. t. To fill up or supply by addition; to add something to.()Causes of one kind must be supplemented by bringing to bear upon them a causation of another kind. (I. Taylor.)a.[Cf. F. supplmentaire.] Added to supply what is wanted; additional; being, or serving as, a supplement; as, a supplemental law; a supplementary sheet or volume.()Supplemental air (Physiol.), the air which in addition to the residual air remains in the lungs after ordinary expiration, but which, unlike the residual air, can be expelled; reserve air. -- Supplemental bill (Equity), a bill filed in aid of an original bill to supply some deffect in the latter, or to set forth new facts which can not be done by amendment. Burrill. Daniel. -- Supplementary chords (Math.), in an ellipse or hyperbola, any two chords drawn through the extremities of a diameter, and intersecting on the curve.()