constant quantity

English Thesaurus

1. a quantity that does not vary (noun.cognition)

hypernym	:	quantity,
definition	:	the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable (noun.cognition)

hyponym	:	parameter, parametric quantity,
definition	:	a constant in the equation of a curve that can be varied to yield a family of similar curves (noun.cognition)