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n.
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"
n.
(biology) a taxonomic category consisting of members of a species that differ from others of the same species in minor but heritable characteristics; "varieties are frequently recognized in botany"
v.
evaluate or estimate the nature, quality, ability, extent, or significance of; "I will have the family jewels appraised by a professional"; "access all the factors when taking a risk"