*supplement*

n. [ F. supplément, 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. [ Obs. ] Chapman. [ 1913 Webster ]

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. [ 1913 Webster ]

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. [ 1913 Webster ]

Syn. -- Appendix. -- Appendix, Supplement. An appendix is that which is appended to something, but is not essential to its completeness; a supplement is that which supplements, or serves to complete or make perfect, that to which it is added. [ 1913 Webster ]

{ } a. [ Cf. F. supplémentaire. ] Added to supply what is wanted; additional; being, or serving as, a supplement; as, a supplemental law; a supplementary sheet or volume. [ 1913 Webster ]

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. [ 1913 Webster ]