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[noun suhp-luh-muh nt; verb suhp-luh-ment] /noun ˈsʌp lə mənt; verb ˈsʌp ləˌmɛnt/
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).
Origin of supplement
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
Related forms
supplementer, noun
unsupplemented, adjective
well-supplemented, adjective
Can be confused
appendix, index, supplement (see synonym study at appendix)
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. 2018.
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Examples from the Web for supplementing
Contemporary Examples
Historical Examples
  • "Too slowly, since swords and pikes have to be supplementing its blade," said Gilbert.

    The Countess of Charny Alexandre Dumas (pere)
  • Two passages from his diary, the second supplementing the first, supply the picture.


    Francis Henry Gribble
  • I shall only be supplementing what you told in your letters, Laura.

    Three Comedies Bjrnstjerne M. Bjrnson
  • Miss Ellsling, on the stage, seemed to be supplementing this remark.

    Harlequin and Columbine Booth Tarkington
  • The other boy joined in at intervals, supplementing my remarks.

    Across the Prairie in a Motor Caravan Frances Halton Eva Hasell
  • From this point of view the Wasps may be regarded as supplementing the Knights.

  • Why should he speak of supplementing the use of gold with silver, any more than supplementing the use of silver with gold?

    The Arena Various
  • They have been tireless in supplementing the service of other organizations.

    America's War for Humanity Thomas Herbert Russell
British Dictionary definitions for supplementing


noun (ˈsʌplɪmənt)
an addition designed to complete, make up for a deficiency, etc
a section appended to a publication to supply further information, correct errors, etc
a magazine or section inserted into a newspaper or periodical, such as one with colour photographs issued every week
  1. either of a pair of angles whose sum is 180°
  2. an arc of a circle that when added to another arc forms a semicircle Abbreviation sup, supp
verb (ˈsʌplɪˌmɛnt)
(transitive) to provide a supplement to, esp in order to remedy a deficiency
Derived Forms
supplementation, noun
supplementer, noun
Word Origin
C14: from Latin supplēmentum, from supplēre to supply1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for supplementing



late 14c., from Latin supplementum "something added to supply a deficiency," from supplere (see supply (v.)).



1829, from supplement (n.). Related: Supplemented; supplementing.

Online Etymology Dictionary, © 2010 Douglas Harper
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