(mathematics, statistics) The value of a variable minus its mean, divided by its standard deviation.

(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.

(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.

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

(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.

(physics) any parameter that would supplement quantum mechanics so as to make it like classical mechanics; local hidden variables have been proved to be inconsistent with quantum mechanics

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

(programming) the association between a variable name (identifier) and its value.