Noun

1. Power to direct or determine
2. A relation of constraint of one entity (thing or person or group) by another
3. (physiology) regulation or maintenance of a function or action or reflex etc
4. A standard against which other conditions can be compared in a scientific experiment
5. The activity of managing or exerting control over something
6. The state that exists when one person or group has power over another
7. Discipline in personal and social activities
8. Great skillfulness and knowledge of some subject or activity
9. A mechanism that controls the operation of a machine
10. A spiritual agency that is assumed to assist the medium during a seance
11. The economic policy of controlling or limiting or curbing prices or wages etc.

Verb

1. Exercise authoritative control or power over
2. Lessen the intensity of; temper; hold in restraint; hold or keep within limits
3. Handle and cause to function
4. Control (others or oneself) or influence skillfully, usually to one's advantage
5. Check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard
6. Verify by using a duplicate register for comparison
7. Be careful or certain to do something; make certain of something
8. Have a firm understanding or knowledge of; be on top of