n.
Pronunciation: ˌ käm-pl ə -( ˌ )men- ' t ā -sh ə n, -m ə n-
Function: noun
Date: 1942
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