one who is appointed to act or speak in place of another; an agent
one to whom rights or property is being transferred
one to whom a thing is assigned
A spy, secret agent, or detective.
An employee or other worker with some particular function or skill.
A participant in an operation.
Functional, in working order.
Effectual or important.
Having the power of acting; hence, exerting force, physical or moral; active in the production of effects.
Producing the appropriate or designed effect; efficacious.
Based upon, or consisting of, a surgical operation or operations.