An operative person or thing.
Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
That operates to produce an effect.
A person or animal who receives treatment from a doctor or other medically educated person.
One who, or that which, is passively affected; a passive recipient.
The noun or noun phrase that is semantically on the receiving end of a verb's action.
Willing to wait if necessary; not losing one's temper while waiting.
Constant in pursuit or exertion; persevering; calmly diligent.