The state of being an employee; employment.
To hire (somebody for work or a job).
To use (somebody for a job, or something for a task).
To make busy.
The act or process of specializing.
The area in which someone specializes.
The adaptation of an organism to a specific environment, or adaptation of an organ to a particular function.
A proof, axiom, problem, or definition whose cases are completely covered by another, broader concept.