Read the dictionary definition of role. All definitions for this word.
1. the actions and activities assigned to or required or expected of a person or group
1. the function of a teacher
2. the government must do its part
3. play its role
2. normal or customary activity of a person in a particular social setting
1. what is your role on the team?
3. what something is used for
1. the function of an auger is to bore holes
2. ballet is beautiful but what use is it?
4. an actor's portrayal of someone in a play
1. she played the part of Desdemona
See also: Merriam-Webster definition of role