parameter

A constant in an equation that varies in other equations of the same general form, especially such a constant in the equation of a curve or surface that can be varied to represent a family of curves or surfaces.

One of a set of independent variables that express the coordinates of a point.

One of a set of measurable factors, such as temperature and pressure, that define a system and determine its behavior and are varied in an experiment.

A factor that restricts what is possible or what results.

A factor that determines a range of variations; a boundary.

A quantity, such as a mean, that is calculated from data and describes a population.

A distinguishing characteristic or feature.

in mathematics,: The third proportional to any diameter of a conic section and its conjugate diameter: specifically this is the parameter of the former of these diameters. The parameter of the transverse axis is called the principal parameter, or the parameter of the curve.