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supplementary

[suhp-luh-men-tuh-ree]
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adjective
  1. Also supplemental. of the nature of or forming a supplement; additional.
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noun, plural sup·ple·men·ta·ries.
  1. a person or thing that is supplementary.
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Origin of supplementary

First recorded in 1660–70; supplement + -ary
Related formsnon·sup·ple·men·ta·ry, adjectivepre·sup·ple·men·ta·ry, adjectiveun·sup·ple·men·ta·ry, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for supplementary

supplementary

adjective
  1. forming or acting as a supplementAlso (less commonly): supplemental (ˌsʌplɪˈmɛntəl)
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noun plural -ries
  1. a person or thing that is a supplement
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Derived Formssupplementarily or rare supplementally, adverb
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

Word Origin and History for supplementary

adj.

1660s, from supplement + -ary.

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Online Etymology Dictionary, © 2010 Douglas Harper