1. the role (The role someone or something is playing.)
2. the roller, the wheel (Like a wheel, but long.)
3. the summersault (Basically a person doing a "rolling" on the floor. )
The core idea of this root was:
rolling, moving
It’s the origin of the Latin rota (wheel) and its small version rotula, which are the origin of words like rotate and (via French) the words role, to roll and roulette.
Also words like round and the German rund ultimately come from the Latin branch.
Role in the sense of character, role in a scene comes from the fact that the texts of an actor were a roll of paper back Rome and Ancient Greece.