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 who performs labor for a living, especially manual labor.
A nonreproductive social insect, such as ant, bee, termite, or wasp.
A female ant, bee, termite or wasp.
A thread performing one instance of a particular task within a program.