A dependent variable is what you measure in the experiment and what is affected during the experiment. The dependent variable responds to the independent variable. It is called dependent because it "depends" on the independent variable. In a scientific experiment, you cannot have a dependent variable without an independent variable; it is the variable being measured, so-called because it may depend on manipulations of the independent variable.
Other /More definition:
dependent variable is a term in an experimental study which is the phenomenon that is measured and expected to be influenced as compared with independent variable
Other /More definition:
Dependent variable refers to the variable being measured, so-called because it may depend on manipulations of the independent variable. In an experiment, it is the variable the experimenter measures; the factor that an experimenter seeks to predict.

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