1 Math. a quantity constant in the case considered but varying in different cases.
2 a an (esp. measurable or quantifiable) characteristic or feature. b (loosely) a constant element or factor, esp. serving as a limit or boundary.
Derivatives:
parametric adj. parametrize v.tr. (also -ise).
Etymology: mod.L f. Gk para beside + metron measure
Useful english dictionary. 2012.