supplement

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Something added to complete a thing, make up for a deficiency, or extend or strengthen the whole.
• noun A section added to a book or document to give further information or to correct errors.
• noun A separate section devoted to a special subject inserted into a periodical, such as a newspaper.
• transitive verb To provide or form a supplement to.

from The Century Dictionary.

• noun An addition to anything, by which it is made more full and complete; particularly, an addition to a book or paper.
• noun Store; supply.
• noun In trigonometry, the quantity by which an angle or an arc falls short of 180° or a semicircle.
• noun Synonyms Appendix, Supplement. An appendix contains additional matter, not essential to the completeness of the principal work, but related to it; a supplement contains additional material, completing or improving the principal work.
• To fill up or supply by additions; add something to, as to a writing, etc.; make up deficiencies in.
• noun In algebra, the supplement of any multiplicative combination E_m of the reference elements e₁, e₂ … e_n and of the m th order is that multiplicative combination E_n–m of the (n–m)th order which contains those reference elements omitted from E_m multiplied in such succession that (E_mE_n–m) = 1. The supplement of E_m is denoted by | E_m.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To fill up or supply by addition; to add something to.
• noun obsolete That which supplies a deficiency, or meets a want; a store; a supply.
• noun 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.
• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Something added, especially to make up for a deficiency.
• noun An extension to a document or publication that adds information, corrects errors or brings up to date.
• noun An additional section of a newspaper devoted to a specific subject.
• noun geometry An angle that, when added to a given angle, makes 180°; a supplementary angle.
• noun nutrition, bodybuilding : A vitamin, herbal extract, or chemical compound included with a diet to enhance muscular development.
• verb To provide or make a supplement to something.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb add to the very end
• verb serve as a supplement to
• noun a quantity added (e.g. to make up for a deficiency)
• verb add as a supplement to what seems insufficient
• noun textual matter that is added onto a publication; usually at the end
• noun a supplementary component that improves capability