Is it ensure, insure, or assure?


[n. suhp-luh-muh nt; v. suhp-luh-ment] /n. ˈsʌp lə mənt; v. 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).
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. 2015.
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Examples from the web for supplemented
  • We supplemented our menu with excellent store-bought goodies, from smoked salmon and salami to cheeses and chocolates.
  • Explore weapons that martial arts fighters have supplemented to their technique.
  • The birds pale in captivity unless their diet is supplemented.
  • The paper should be supplemented with maps, graphic organizers, and data that illustrate your findings.
  • The quest for an alien microbe is supplemented by a continuing effort to find something large, intelligent, and communicative.
  • Fish are supplemented by crustaceans, snakes, and other river creatures.
  • These were supplemented with hundreds of film and digital photographs.
  • And it's supplemented by thousands of human censors who scour blogs, chat rooms, and everything else for offending content.
  • Newsletters, magazines, and books will be supplemented by the ability of their subscribers to ask direct questions of authors.
  • We are designed to eat meat supplemented with foods of high nutrient value, ie fruits and vegetables, nuts and seeds.
British Dictionary definitions for supplemented


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 supplemented



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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