Variable means something that changes. X, for example, is a variable, as it can be many different numbers.
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For example in the term 3x the number is the coefficient of the variable x
The opposite of the word "constant" is "variable".
The dependent variable depends on the independent variable for its values as for example in the straight line equation y = 2x+6 whereas y is the dependent variable and x is the independent variable
If a term doesn't have a variable , then its probably a constant.
inconstant, mutable