amerikai:
brit:
1. A person who performs, plays a part in a theatrical play or film.
2. One who acts; a doer.
3. One who takes part in a situation.
4. An advocate or proctor in civil courts or causes.
5. One who institutes a suit; plaintiff or complainant.
6. (policy debate) One who enacts a certain policy action.
7. The entity that performs a role (in use case analysis).
8. (grammar) The most agent-like argument of a clause, e.g. 'the torpedo' in "The torpedo sank the boat" and "The torpedo fired".