noun
actor
AK-ter/ˈæktər/
A person or entity that takes part in an action.
The actor performs in costume beneath the bright stage lights.

Etymology
An actor is literally a doer or performer. The theatrical connection was already present in Latin: agere could mean performing on stage or playing a part, as well as doing something more generally.
In context
we had a wonderful actor gavin muir who could read music and who learned the part quite easily and performed in the first run
More examples
- Several actors rehearse their lines in the hallway.
- The report identifies the major actors in the negotiations.
- A foreign actor attempted to influence the election.
Forms
actor · actors
acting noun — The work of portraying characters in performances.
Similar words
- performer
- Includes musicians and dancers as well as dramatic actors.
- participant
- Emphasizes involvement rather than the capacity to take action.