See role-playing in Webster's New World College Dictionary
noun
a technique in training or psychotherapy in which participants assume and act out roles so as to resolve conflicts, practice appropriate behavior for various situations, etc.
See role-playing in American Heritage Dictionary 4
(rōlˈplāˌĭng)
noun
Psychology A therapeutic technique, designed to reduce conflict in social situations, in which participants act out particular behavioral roles in order to expand their awareness of differing points of view.
An instance or situation in which one deliberately acts out or assumes a particular character or role.