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The term for replacing a variable with another value or expression is "substitution."
Variable is any letter used in an algebraic expression, and can vary (change form) to be any number, and one variable means the same number in any single algebraic expression. Usually algebra is simplifying the expression or equation until you know what the variable is equal to.
That means that you replace something, for something else. For example, a variable for a number, or a variable for some other expression.
Assuming you call your number "n", the expression would be "14n". You can replace "n" with whatever variable you want to use.
The number is called the coefficient of the variable