supplement Meaning, Definition & Usage

noun textual matter that is added onto a publication; usually at the end
postscript; addendum.
noun a quantity added (e.g. to make up for a deficiency)
supplementation.
noun a supplementary component that improves capability
add-on; appurtenance; accessory.
verb add as a supplement to what seems insufficient
- supplement your diet
verb serve as a supplement to
- Vitamins supplemented his meager diet
verb add to the very end
affix; add on; append.
- He appended a glossary to his novel where he used an invented language

F. supplément, L. supplementum, fr. supplere to fill up. See Supply, v. t.

That which supplies a deficiency, or meets a want; a store; a supply. Obs. Chapman.
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.
(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. 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.

imperfect & past participle Supplemented; present participle & verbal noun Supplementing

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.