degree of freedom (statistics) an unrestricted variable in a frequency distribution
dependent variable (statistics) a variable in a logical or mathematical expression whose value depends on the independent variable; "if f(x)=y, y is the dependent variable"
predictor variable a variable that can be used to predict the value of another variable (as in statistical regression)
infinitesimal (mathematics) a variable that has zero as its limit
star (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
Adjective
variable -
liable to or capable of change; "rainfall in the tropics is notoriously variable"; "variable winds"; "variable expenses"
invariable not liable to or capable of change; "an invariable temperature"; "an invariable rule"; "his invariable courtesy"
inconsistent displaying a lack of consistency; "inconsistent statements cannot both be true at the same time"; "inconsistent with the roadmap"
inconstant likely to change frequently often without apparent or cogent reason; variable; "inconstant affections"; "an inconstant lover"; "swear not by...the inconstant moon"- Shakespeare
changeable,
unsettled,
uncertain such that alteration is possible; having a marked tendency to change; "changeable behavior"; "changeable moods"; "changeable prices"
covariant changing so that interrelations with another variable quantity or set of quantities remain unchanged
multivariate pertaining to any procedure involving two or more variables
protean taking on different forms; "eyes...of that baffling protean grey which is never twice the same"
variant differing from a norm or standard; "a variant spelling"
variable -
(used of a device) designed so that a property (as e.g. light) can be varied; "a variable capacitor"; "variable filters in front of the mercury xenon lights"
adaptable capable of adapting (of becoming or being made suitable) to a particular situation or use; "to succeed one must be adaptable"; "the frame was adaptable to cloth bolts of different widths"
Variable -
marked by diversity or difference; "the varying angles of roof slope"; "nature is infinitely variable"