independent variable
noun/ˌɪndɪpendənt ˈveəriəbl/
/ˌɪndɪpendənt ˈveriəbl/, /ˌɪndɪpendənt ˈværiəbl/
(mathematics)- a variable whose value does not depend on another variable
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independent variable
Definition of independent variable noun from the Oxford Advanced Learner's Dictionary