independent variable
noun [ C ] mathematics specialized uk/ˌɪn.dɪ.pen.dənt ˈveə.ri.ə.bəl/ us/ˌɪn.dɪ.pen.dənt ˈver.i.ə.bəl/
自变量（一个数字或数量的价值不受数学表达式里其他量的影响）
a number or amount whose value does not depend on the value of another element in the same mathematical expression (= group of symbols representing an amount or idea)
Compare: dependent variable