[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
Supplement existing plants, such as the azaleas and ferns pictured above, with
  an edging of white cyclamen.
Some nutrition labels note whether a nondairy milk's calcium supplement is
  equal to the calcium in cow's milk.
For this reason multimedia can be a terrifically useful teaching supplement.
All supplement use was self-reported by the subjects.
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