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complementation

noun

com·​ple·​men·​ta·​tion ˌkäm-plə-(ˌ)men-ˈtā-shən How to pronounce complementation (audio)
-mən-
1
: the operation of determining the complement of a mathematical set
2
: production of normal phenotype in an individual heterozygous for two closely related mutations with one on each homologous chromosome and at a slightly different position

Word History

First Known Use

1942, in the meaning defined at sense 1

Time Traveler
The first known use of complementation was in 1942

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