[n. suhp-luh-muhnt; v. suhp-luh-ment]
something added to complete a thing, supply a deficiency, or reinforce or extend a whole.
a part added to a book, document, etc., to supply additional or later information, correct errors, or the like.
a part, usually of special character, issued as an additional feature of a newspaper or other periodical.
Geometry. the quantity by which an angle or an arc falls short of 180° or a semicircle.
verb (used with object)
to complete, add to, or extend by a supplement.
to form a supplement or addition to.
to supply (a deficiency).

1350–1400; Middle English < Latin supplēmentum that by which anything is made full, equivalent to sup- sup- + plē- (stem of plēre to fill; see full1) + -mentum -ment

supplementer, noun
unsupplemented, adjective
well-supplemented, adjective

1. appendix, index, supplement (see synonym study at appendix) ; 2. complement, supplement (see synonym study at complement).

2. addendum, epilogue, postscript. See appendix. 5. See complement. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  an addition designed to complete, make up for a deficiency, etc
2.  a section appended to a publication to supply further information, correct errors, etc
3.  a magazine or section inserted into a newspaper or periodical, such as one with colour photographs issued every week
4.  geometry
 a.  either of a pair of angles whose sum is 180°
 b.  sup, Abbreviation: supp an arc of a circle that when added to another arc forms a semicircle
5.  (tr) to provide a supplement to, esp in order to remedy a deficiency
[C14: from Latin supplēmentum, from supplēre to supply1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1382, from L. supplementum "something added to supply a deficiency," from supplere (see supply). The verb is first recorded 1829.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The supplements industry claims its products can boost your intelligence.
The squalene added to food, cosmetics, and health supplements is generally
  derived from shark liver oil.
Dietary supplements are another way to get the vitamins you need if the food
  you eat is not supplying enough vitamins.
Individual supplements of any vitamin or food chemical have not shown any
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