The purpose of this paper is to describe (a) multivariable calculus students' meanings for the domain and range of single and multivariable functions and (b) how they generalize their meanings for domain and range from single-variable to multivariable functions. We first describe how students think about domain and range of multivariable functions as inputs and outputs, independent and dependent quantities, and as associated with particular variables. We then use an actor-oriented transfer framework to describe the ways in which students identify similarities between domain and range in single- and multivariable functions, and how they use these similarities to generalize their meanings for domain and range. [For the complete proceedings, see ED597799.]