variety

A deviation or difference.

A specific variation of something.

An animal or plant (or a group of such animals or plants) with characteristics causing it to differ from other animals or plants of the same species; a strain or cultivar.

A rank in a taxonomic classification below species and (if present) subspecies, and above form; hence, an organism of that rank.

A specific form of a language, neutral to whether that form is an accent, dialect, register, etc., and to its prestige level; an isolect or lect.

A stamp, or set of stamps, which has one or more characteristics (such as colour, paper, etc.) differing from other stamps in the same issue, especially if such differences are intentionally introduced.

A collection or number of different things.

In universal algebra: an equational class; the class of all algebraic structures of a given signature, satisfying a given set of identities.

Ellipsis of algebraic variety (“the set of solutions of a given system of polynomial equations over the real or complex numbers; any of certain generalisations of such a set that preserves the geometric intuition implicit in the original definition”).

The total number of distinct states of a system; also, the logarithm to the base 2 of the total number of distinct states of a system.