A specific variation of something
A state of constant change
(taxonomy) A rank in a taxonomic classification, below species.
(cybernetics) The total number of distinct states of a system.
(cybernetics) Logarithm of the base 2 of the total number of distinct states of a system.
(linguistics) a term used for a specific form of a language, neutral to whether that form is a dialect, accent, register, and to its prestige level.