1. (noun)discrepancy, variance, variant an event that departs from expectations
2. (noun)form, variant, strain, var. (biology) a group of organisms within a species that differ in trivial ways from similar groups "a new strain of microorganisms"
3. (noun)random variable, variate, variant, stochastic variable, chance variable a variable quantity that is random
4. (noun)version, variant, variation, edition something a little different from others of the same type "an experimental version of the night fighter"; "a variant of the same word"; "an emery wheel is the modern variation of a grindstone"; "the boy is a younger edition of his father"
5. (adj)variant differing from a norm or standard "a variant spelling"
6. (adj)variant exhibiting variation and change "letters variant in size"