variant
     adj : differing from a norm or standard; "a variant spelling"
     n 1: an event that departs from expectations [syn: {discrepancy},
           {variance}]
     2: (biology) a group of organisms within a species that differ
        in trivial ways from similar groups; "a new strain of
        microorganisms" [syn: {form}, {strain}, {var.}]
     3: a variable quantity that is random [syn: {random variable},
        {variate}, {stochastic variable}, {chance variable}]
     4: something a little different from others of the same type;
        "an experimental version of the night fighter"; "an emery
        wheel is a modern variant of the grindstone"; "the boy is
        a younger edition of his father" [syn: {version}, {variation},
         {edition}]
Source: WordNet® 2.0