roleplay

Short definition from Wiktionary

Verb

1. 1
   To act out a scenario or fantasy with another person or other people.
2. 2
   To act as a character as part of a fantasy, especially with a group.
3. 3
   To act out a social role, especially one that one does not truly belong to.

Noun

1. 1
   The act or practice of roleplaying; an instance of roleplaying.
2. 2
   The practice of roleplaying.