|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|the offspring of a zebra and a donkey.|
|1.||the act or process of forming a complement|
|2.||genetics the combination of two homologous chromosomes, each with a different recessive mutant gene, in a single cell to produce a normal phenotype. The deficiency of one homologue is supplied by the normal allele of the other|
complementation com·ple·men·ta·tion (kŏm'plə-mən-tā'shən, -měn-)
Functional interaction between two defective viruses permitting replication under conditions inhibitory to the single virus.
Interaction between two genetic units, one or both of which are defective, permitting the organism containing these units to function normally, whereas it could not do so if one unit were absent.