In math, a variable is a letter used in place of an unknown number in equations, expressions, and formulas. The variable is used as a placeholder for the unknown number. In
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variable ( ˈvɛərɪəbəl) adj 1. liable to or capable of change: variable weather. 2. (of behaviour, opinions, emotions, etc) lacking constancy; fickle 3. (Mathematics) maths having a range of