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From The Collaborative International Dictionary of English v.0.48:
genotype \gen"o*type\ n. (Genetics) A group of organisms sharing a specific genetic constitution. [WordNet sense 1] [WordNet 1.5] 2. (Genetics) The genetic constitution of an organism, specifying the particular alleles at defined loci in the genome; -- used with respect to one gene, a specific group of genes, or the entire set of genes within the organism. Contrasted with phenotype. Syn: genetic constitution. [WordNet 1.5 + PJC] genotypic