Thesaurus
Synonyms & Antonyms of supplementary
1
available to supply something extra when needed
- the teacher's edition of the textbook comes with a lot of supplementary material
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Antonyms for supplementary
2
related to each other in such a way that one completes the other
- regards theology and philosophy as supplementary fields of study
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“Supplementary.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/supplementary. Accessed 27 Oct. 2021.
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The first known use of supplementary was in 1667
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