sup·​ple·​men·​ta·​ry | \ ˌsə-plə-ˈmen-tə-rē How to pronounce supplementary (audio) , -ˈmen-trē\

Definition of supplementary

1 : added or serving as a supplement : additional supplementary reading
2 : being or relating to a supplement or a supplementary angle

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Synonyms & Antonyms for supplementary


accessorial, accessory, appurtenant, auxiliary, peripheral, supplemental


chief, main, principal

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Examples of supplementary in a Sentence

a list of supplementary material for the class the teacher's edition of the textbook comes with a lot of supplementary material

Recent Examples on the Web

Some areas recycle tires by using them as supplementary fuel in cement kilns. Mike Allen, Popular Mechanics, "How to Dispose of Hazardous Waste Without Damaging the Environment," 9 Oct. 2018 Oftentimes, people talk about the gig economy as ‘supplementary income’ ... Eric Johnson, Recode, "Silicon Valley has been treating workers ‘miserably’ since the 1970s," 29 Aug. 2018 In fact, this is supplementary information that would fit under the Virus Definition tile. Ian Paul, PCWorld, "K7 Ultimate Security review: Simple yet sophisticated," 28 Aug. 2018 As of last month, there were 3.2 trillion yuan ($463 billion) worth of outstanding loans for Pledged supplementary lending, a type of financing tool, according to the People’s Bank of China. Dominique Fong, WSJ, "Smaller Cities Are a Big Worry in China’s Too-Hot Property Market," 15 Aug. 2018 The United States, however, has not ratified the 1992 Convention on Biological Diversity (CBD), to which the 2010 Nagoya Protocol is a supplementary agreement, and would not be bound by changes to the protocol. Kai Kupferschmidt, Science | AAAS, "Plan to amend biopiracy rules would ‘smother research,’ biologists warn," 3 July 2018 Taxpayers with any items on those supplementary forms—such as student-loan interest or education tax credits—must complete those schedules, too. Richard Rubin, WSJ, "There’s a New 1040 Tax Form. Will Millions of E-Filers Even Notice?," 29 June 2018 Children’s librarians have suggested offering Little House fans the Birchbark series, by American Indian author Louise Erdrich, as either counter-programming or supplementary reading. Constance Grady, Vox, "Laura Ingalls Wilder’s Little House books are beautiful. They are also filled with racism.," 26 June 2018 But there are almost no details about this supplementary DOJ spending, which is not paid for by the permanent, indefinite appropriation for special counsels. Salvador Rizzo, Washington Post, "Fact-checking President Trump’s attacks on the cost of Mueller’s investigation," 4 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'supplementary.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of supplementary

1667, in the meaning defined at sense 1

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Statistics for supplementary

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Time Traveler for supplementary

The first known use of supplementary was in 1667

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More Definitions for supplementary


sup·​ple·​men·​ta·​ry | \ ˌsə-plə-ˈmen-tə-rē How to pronounce supplementary (audio) \

Kids Definition of supplementary

: added to something else : additional supplementary income


sup·​ple·​men·​ta·​ry | \ ˌsəp-lə-ˈment-ə-rē, -ˈmen-trē How to pronounce supplementary (audio) \

Medical Definition of supplementary

: added or serving as a supplement supplementary vitamins


sup·​ple·​men·​ta·​ry | \ ˌsə-plə-ˈmen-tə-rē, -trē How to pronounce supplementary (audio) \

Legal Definition of supplementary

: added or serving as a supplement

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