Control

1. (noun) Influence or authority over something. 2. (noun) A separate group or subject in an experiment against which the results are compared where the primary variable is low or non-existent. 3. (noun) The method and means of governing the performance of any apparatus, machine or system, such as a lever, handle or button. 4. (noun) Restraint or ability to contain one's movements or emotions, or self-control. 5. (noun) A security mechanism, policy, or procedure that can counter system attack, reduce risks, and resolve vulnerabilities; a safeguard or countermeasure. 6. (noun) (project management) A means of monitoring for, and triggering intervention in, activities that are not going according to plan. 7. (noun) A duplicate book, register, or account, kept to correct or check another account or register. 8. (noun) An interface element that a computer user interacts with, such as a window or a text box. 9. (noun) Any of the physical factors determining the climate of a place, such as latitude, distribution of land and water, altitude, exposure, prevailing winds, permanent high- or low-barometric-pressure areas, ocean currents, mountain barriers, soil, and vegetation. 10. (noun) A construction in which the understood subject of a given predicate is determined by an expression in context. See control. 11. (verb) To exercise influence over; to suggest or dictate the behavior of. 12. (verb) (construed with for) To design (an experiment) so that the effects of one or more variables are reduced or eliminated.