Definitions from Wiktionary ( )

▸ verb:  (transitive) To exercise influence over; to suggest or dictate the behavior of.
▸ verb:  (transitive, statistics) (construed with for) To design (an experiment) so that the effects of one or more variables are reduced or eliminated.
▸ verb:  (transitive, archaic) To verify the accuracy of (something or someone, especially a financial account) by comparison with another account.
▸ verb:  (transitive, obsolete) To call to account, to take to task, to challenge.
▸ verb:  (transitive) To hold in check, to curb, to restrain.
▸ noun:  (countable, uncountable) Influence or authority over something.
▸ noun:  The method and means of governing the performance of any apparatus, machine or system, such as a lever, handle or button.
▸ noun:  Restraint or ability to contain one's movements or emotions, or self-control.
▸ noun:  A security mechanism, policy, or procedure that can counter system attack, reduce risks, and resolve vulnerabilities; a safeguard or countermeasure.
▸ noun:  (project management) A means of monitoring for, and triggering intervention in, activities that are not going according to plan.
▸ noun:  A control group or control experiment.
▸ noun:  A duplicate book, register, or account, kept to correct or check another account or register.
▸ noun:  (graphical user interface) An interface element that a computer user interacts with, such as a window or a text box (abbreviated Ctrl).
▸ noun:  (climatology) 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.
▸ noun:  (linguistics) A construction in which the understood subject of a given predicate is determined by an expression in context. See control.
▸ noun:  (spiritualism, parapsychology) A spirit that takes possession of a psychic or medium and allows other spirits to communicate with the living.
▸ noun:  (cycling, countable) A checkpoint along an audax route.

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