(sociolinguistics) A feature, either lexical or phonetical, that is correlated with extralingual factors such as the setting, speaker, addressee etc.

M31-V1: A star, a cepheid variable in Andromeda Galaxy, Local Group, Local Supercluster, Laniakea, located in the Andromeda constellation; the first variable star discovered outside the Milky Way Galaxy, and first star identified whose distance was unequivocably beyond the confines of the Milky Way.

(algebra) In an equation, any variable whose value is not dependent on any other in the equation. / (sciences) The variable that is changed or manipulated in a series of experiments.

(algebra) In an equation, the variable whose value depends on one or more variables in the equation. / (sciences) An outcome measured to see the effectiveness of the treatment.

(chiefly programming) A conventional variable name used for an unspecified entity whose exact nature depends on context.

A passerine bird of the antbird family, in species Thamnophilus caerulescens.

(physics) A variable whose value is determined by measuring a difference of the values at two extreme points of an element; thus voltage is a difference in two levels of potential.

(astronomy) A star in which the strength of the helium absorption lines vary periodically; at times appearing to be a helium star.

(programming) A variable that is associated with a value, and therefore a variable that has an allocated storage location. If the programming language implements a representation of a canonical unknown value, infinity, etc., the value bound to the variable may be one of these.

(astronomy) A radially pulsating (expanding and contracting) variable star with a regular period and known relationship between period and intrinsic brightness.