A subdivision of a species in other scientific disciplines.
A taxon at that rank, often indicated with trinomial nomenclature (such as Felis silvestris silvestris in zoology and Pinus nigra subsp. salzmannii in botany).
A rank in the classification of organisms, below species.
A different sequence of a gene (locus).
Something that is slightly different from a type or norm.
A variable that can hold any of various unrelated data types.
One of a set of words or other linguistic forms that conveys the same meaning or serves the same function.
Showing deviation or disagreement.
Showing variety, diverse.
Covariant and/or contravariant.