antonym
A term added to an equation or formula that exactly cancels the contribution of another term which diverges.
antithesis
One of a set of words or other linguistic forms that conveys the same meaning or serves the same function.
Something that is slightly different from a type or norm.
A different sequence of a gene (locus).
A variable that can hold any of various unrelated data types.
Showing deviation or disagreement.
Showing variety, diverse.
Covariant and/or contravariant.