# Parameter vs. Variable

## Difference Between Parameter and Variable

#### Parameternoun

A value kept constant during an experiment, equation, calculation or similar, but varied over other versions of the experiment, equation, calculation, etc.

#### Variableadjective

Able to vary.

*variable winds or seasons; a variable quantity*

#### Parameternoun

(sciences) a variable that describes some system (material, object, event etc.) or some aspect thereof

#### Variableadjective

Likely to vary.

#### Parameternoun

(programming) An input variable of a procedure definition, that gets an actual value (argument) at execution time (formal parameter).

*Roughly, a tuple of arguments could be thought of as a vector, whereas a tuple of parameters could be thought of as a covector (i.e., linear functional). When a function is called, a parameter tuple becomes "bound" to an argument tuple, allowing the function instance itself to be computed to yield a return value. This would be roughly analogous to applying a covector to a vector (by taking their dot product (or, rather, matrix-product of row vector and column vector)) to obtain a scalar.*

#### Variableadjective

Marked by diversity or difference.

#### Parameternoun

(programming) An actual value given to such a formal parameter (argument or actual parameter).

#### Variableadjective

(mathematics) Having no fixed quantitative value.

#### Parameternoun

A characteristic or feature that distinguishes something from others.

#### Variableadjective

(biology) Tending to deviate from a normal or recognized type.

#### Parameternoun

(geometry) In the ellipse and hyperbola, a third proportional to any diameter and its conjugate, or in the parabola, to any abscissa and the corresponding ordinate.

*The parameter of the principal axis of a conic section is called the latus rectum.*

#### Variablenoun

Something that is variable.

#### Parameternoun

(crystallography) The ratio of the three crystallographic axes which determines the position of any plane.

#### Variablenoun

Something whose value may be dictated or discovered.

*There are several variables to consider here.*

#### Parameternoun

(crystallography) The fundamental axial ratio for a given species.

#### Variablenoun

(mathematics) A quantity that may assume any one of a set of values.

#### Parameternoun

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

#### Variablenoun

(mathematics) A symbol representing a variable.

#### Parameternoun

any factor that defines a system and determines (or limits) its performance

#### Variablenoun

(programming) A named memory location in which a program can store intermediate results and from which it can read them.

#### Parameternoun

a quantity (such as the mean or variance) that characterizes a statistical population and that can be estimated by calculations from sample data

#### Variablenoun

(astronomy) A variable star.

#### Variablenoun

(nautical) A shifting wind, or one that varies in force.

#### Variablenoun

Those parts of the sea where a steady wind is not expected, especially the parts between the trade-wind belts.

#### Variablenoun

something that is likely to vary; something that is subject to variation;

*the weather is one variable to be considered*

#### Variablenoun

a quantity that can assume any of a set of values

#### Variablenoun

a star that varies noticeably in brightness

#### Variablenoun

a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity

#### Variableadjective

liable to or capable of change;

*rainfall in the tropics is notoriously variable*

*variable winds*

*variable expenses*

#### Variableadjective

marked by diversity or difference;

*the varying angles of roof slope*

*nature is infinitely variable*

#### Variableadjective

(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*