What is the definition of the variable?

Answer 1

Answer in definitions

1. Something that varies in value.

2. A temporary storage place used in computer applications during calculation.

3. An algebraic term which is undefined but tied to the value of an expression.

In programming, a variable represents a temporary storage location, used by the program to store something.

For example, in:

var x = read();

print "you printed ", x

"x" is a variable.

In science, a variable is a factor that can be or is changed in an experiment. Often all variables except two are kept the same, while one (the independent variable) is changed for the experiment, and the other (the dependent variable) changes depending on the independent variable's value.

In mathematics, a variable is as defined above; an term which can change in value, this value being necessary to the value of an overall expression it is in.
control variables are those variables that are not changed throughout the trails in an experiment.

Answer 2

By definition, variable means not consistent. A variable has no fixed pattern and is liable to change. It is hard to control.