• Influence or authority over something.
  • The method and means of governing the performance of any apparatus, machine or system, such as a lever, handle or button.
  • Restraint or ability to contain one's movements or emotions, or self-control.
  • A security mechanism, policy, or procedure that can counter system attack, reduce risks, and resolve vulnerabilities; a safeguard or countermeasure.
  • A means of monitoring for, and triggering intervention in, activities that are not going according to plan.
  • A control group or control experiment.
  • A duplicate book, register, or account, kept to correct or check another account or register.
  • An interface element that a computer user interacts with, such as a window or a text box.
  • 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.
  • A construction in which the understood subject of a given predicate is determined by an expression in context. See control.
  • A spirit that takes possession of a psychic or medium and allows other spirits to communicate with the living.


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  • From Middle English controllen, from Old French contrerole, from Medieval Latin contrarotulum, from Latin contra + Medieval Latin rotulus, Latin rotula, diminutive of rota.

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