# The difference between Parameter and Variable

When used as nouns, parameter means a value kept constant during an experiment, equation, calculation or similar, but varied over other versions of the experiment, equation, calculation, etc, whereas variable means something that is variable.

Variable is also adjective with the meaning: able to vary.

check bellow for the other definitions of Parameter and Variable

1. Parameter as a noun:

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

2. Parameter as a noun (sciences):

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

3. Parameter as a noun (programming):

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

###### Examples:

"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."

4. Parameter as a noun (programming):

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

5. Parameter as a noun:

A characteristic or feature that distinguishes something from others.

6. Parameter as a noun (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.

###### Examples:

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

7. Parameter as a noun (crystallography):

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

8. Parameter as a noun (crystallography):

The fundamental axial ratio for a given species.

Able to vary.

###### Examples:

"variable winds or seasons; a variable quantity"

Likely to vary.

Marked by diversity or difference.

4. Variable as an adjective (mathematics):

Having no fixed quantitative value.

5. Variable as an adjective (biology):

Tending to deviate from a normal or recognized type.

1. Variable as a noun:

Something that is variable.

2. Variable as a noun:

Something whose value may be dictated or discovered.

###### Examples:

"There are several variables to consider here."

3. Variable as a noun (mathematics):

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

4. Variable as a noun (mathematics):

A symbol representing a variable.

5. Variable as a noun (programming):

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

6. Variable as a noun (astronomy):

A variable star.

7. Variable as a noun (nautical):

A shifting wind, or one that varies in force.

8. Variable as a noun (nautical, in the plural):

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