1
: not having a numerical value equal to the sum of values for the component parts
2
: of, relating to, or being a genetic effect that is not additive
nonadditive effects of epistasis

Examples of nonadditive in a Sentence

Recent Examples on the Web
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But the trouble is, the twin data just aren't consistent with the idea that nonadditive effects explain any of these traits. — Neuroskeptic, Discover Magazine, 9 Oct. 2013

Word History

First Known Use

1907, in the meaning defined at sense 1

Time Traveler
The first known use of nonadditive was in 1907

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Cite this Entry

“Nonadditive.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nonadditive. Accessed 30 Sep. 2026.

Medical Definition

nonadditive

adjective
: of, relating to, or being a genetic effect that is not additive
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