[ noun suhp-luh-muhnt; verb suhp-luh-ment ]
See synonyms for: supplementsupplementedsupplementingsupplements on

  1. something added to complete a thing, supply a deficiency, or reinforce or extend a whole.

  2. a part added to a book, document, etc., to supply additional or later information, correct errors, or the like.

  1. a part, usually of special character, issued as an additional feature of a newspaper or other periodical.

  2. Geometry. the quantity by which an angle or an arc falls short of 180° or a semicircle.

verb (used with object)
  1. to complete, add to, or extend by a supplement.

  2. to form a supplement or addition to.

  1. to supply (a deficiency).

Origin of supplement

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

synonym study For supplement

2. See appendix. 5. See complement.

Other words for supplement

Other words from supplement

  • sup·ple·ment·er, noun
  • un·sup·ple·ment·ed, adjective
  • well-sup·ple·ment·ed, adjective

Words that may be confused with supplement Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use supplement in a sentence

British Dictionary definitions for supplement


  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

  1. a magazine or section inserted into a newspaper or periodical, such as one with colour photographs issued every week

  2. geometry

    • either of a pair of angles whose sum is 180°

    • an arc of a circle that when added to another arc forms a semicircle: Abbreviation: sup, supp

  1. (tr) to provide a supplement to, esp in order to remedy a deficiency

Origin of supplement

C14: from Latin supplēmentum, from supplēre to supply 1

Derived forms of supplement

  • supplementation, noun
  • supplementer, noun

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