a constant in the equation of a curve that can be varied to yield a family of similar curves

a fixed object in any equation

a named constant

a specific coefficient in the equations, E

a quantity in an equation. It can be constant or can vary from one situation to the next. The stiffness of the spring is a parameter that is of importance in deciding by how much the spring will be compressed.

For B-splines, this refers to the independent value or parameter that is used to define the curve or surface. For curves, the parameter is called 'u' and its value changes from 0.0 at one end of the curve to 1.0 at the other end. Rectangular-like B-spline surfaces have two parameters: constant 'u' for the row direction and constant 'v' for the column direction. Their values also range from 0.0 to 1.0, so that every combination of 'u' and 'v' values between 0.0 and 1.0 define the entire surface.

A component of a model or equation that must be estimated graphically or by non-linear regression. Examples include V and kel.

A quantity or value normally constant but which can vary in different cases; a measurable or quantifiable characteristic of something. Shown in the Attribute Manager : Parameter button

Constants applied to a model that are obtained by theoretical calculation or measurements taken at another time and/or place, and are assumed to be appropriate for the time and place being studied (EPA 1997).