role (n.) Look up role at Dictionary.com
"part or character one takes," c.1600, from French rôle "part played by a person in life," literally "roll (of paper) on which an actor's part is written," from Old French rolle (see roll (n.)). Meaning "function performed characteristically by someone" is from 1875. In the social psychology sense from 1913. Role model first attested 1957.