[kuh n-trohl] /kənˈtroʊl/
verb (used with object), controlled, controlling.
to exercise restraint or direction over; dominate; command: The car is difficult to control at high speeds.
That zone is controlled by enemy troops.
to hold in check; curb:
to control a horse; to control one’s emotions.
to test or verify (a scientific experiment) by a parallel experiment or other standard of comparison.
to eliminate or prevent the flourishing or spread of:
to control a forest fire.
Obsolete. to check or regulate (transactions), originally by means of a duplicate register.
the act or power of controlling; regulation; domination or command:
Who’s in control here?
the situation of being under the regulation, domination, or command of another:
The car is out of control.
check or restraint:
Her anger is under control.
a legal or official means of regulation or restraint:
to institute wage and price controls.
Statistics. (def 1).
a person who acts as a check; .
a device for regulating and guiding a machine, as a motor or airplane.
controls, a coordinated arrangement of such devices.
prevention of the flourishing or spread of something undesirable:
Baseball. the ability of a pitcher to throw the ball into the strike zone consistently:
The rookie pitcher has great power but no control.
Philately. any device printed on a postage or revenue stamp to authenticate it as a government issue or to identify it for bookkeeping purposes.
a spiritual agency believed to assist a medium at a séance.
the supervisor to whom an espionage agent reports when in the field.
control for, Statistics. to account for (variables in an analysis) by limiting the data under consideration to a comparison of like things:
to control for demographic factors.
verb (transitive) -trols, -trolling, -trolled
to command, direct, or rule: to control a country
to check, limit, curb, or regulate; restrain: to control one’s emotions, to control a fire
to regulate or operate (a machine)
to verify (a scientific experiment) by conducting a parallel experiment in which the variable being investigated is held constant or is compared with a standard
to restrict or regulate the authorized supply of (certain substances, such as drugs)
power to direct or determine: under control, out of control
a means of regulation or restraint; curb; check: a frontier control
(often pl) a device or mechanism for operating a car, aircraft, etc
a standard of comparison used in a statistical analysis or scientific experiment
(spiritualism) an agency believed to assist the medium in a séance
Also called control mark. a letter, or letter and number, printed on a sheet of postage stamps, indicating authenticity, date, and series of issue
one of a number of checkpoints on a car rally, orienteering course, etc, where competitors check in and their time, performance, etc, is recorded
1580s, past participle adjective from control (v.). Of rent, from c.1930.
early 14c., “to check, verify, regulate,” from Anglo-French contreroller “exert authority,” from Medieval Latin contrarotulus “a counter, register,” from Latin contra- “against” (see contra) + rotulus, diminutive of rota “wheel” (see roll (n.)). From a medieval method of checking accounts by a duplicate register. Sense of “dominate, direct” is mid-15c. Related: Controlled; controlling.
Control group in scientific experiments is attested from 1952 (from a sense of control attested since 1875).
1580s, from control (v.). Control freak is late 1960s slang.
control con·trol (kən-trōl’)
v. con·trolled, con·trol·ling, con·trols
A standard of comparison for checking or verifying the results of an experiment. In an experiment to test the effectiveness of a new drug, for example, one group of subjects (the control group) receives an inactive substance or placebo , while a comparison group receives the drug being tested.
noun 1. an experiment or trial that uses controls, usually separating the subjects into one or more control groups and experimental groups. noun a trial or experiment that includes a control (comparison) group; also called controlled study ; any trial or test of a hypothesis under carefully managed conditions
- Controlled explosion
noun 1. the deliberate detonation of an explosive device under strictly controlled circumstances
- Controlled hypotension
controlled hypotension n. See induced hypotension.
- Controlled mechanical ventilation
controlled mechanical ventilation n. Abbr. CMV A method of artificial ventilation in which all inspirations are provided by positive pressure applied to the airway. Also called continuous positive pressure breathing, continuous positive pressure ventilation, intermittent positive pressure breathing, intermittent positive pressure ventilation.