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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   SNP
       n 1: (genetics) genetic variation in a DNA sequence that occurs
            when a single nucleotide in a genome is altered; SNPs are
            usually considered to be point mutations that have been
            evolutionarily successful enough to recur in a significant
            proportion of the population of a species [syn: single
    nucleotide polymorphism, SNP]