[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:
rodent control.
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.
Verb phrases
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

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.
(Or “ctrl”, “^”) One (or a pair) of modifier keys found on all modern keyboards. If the control key is held down while pressing and releasing certain other keys then a “control character” is generated, e.g. holding control and hitting “A” generates control-A (ASCII code 1). The ASCII code for the control character is generally 64 less than that for the unmodified character.
The control key does not generate any character on its own but most modern keyboards and operating systems allow a program to tell whether each of the individual keys on the keyboard (including modifier keys) is pressed at any time.
Control characters mostly have some kind of “non-printing” effect on the output such as ringing the bell (Control-G) or advancing to the next line (Control-J). Most have alternative names suggesting these functions (Bell, Line Feed, etc.).
See ASCII character table.


Read Also:

  • Control-account

    noun 1. a general account showing totals of transactions with detailed figures appearing in subsidiary ledgers. noun 1. (accounting) an account to which are posted the debit and credit totals of other accounts, usually in preparation of financial statements

  • Control and status register

    hardware (CSR) A register in most CPUs which stores additional information about the results of machine instructions, e.g. comparisons. It usually consists of several independent flags such as carry, overflow and zero. The CSR is chiefly used to determine the outcome of conditional branch instructions or other forms of conditional execution. (1998-06-26)

  • Control-board

    noun 1. a panel containing switches, dials, and other equipment for regulating electrical devices, lights, etc.

  • Control bus

    architecture In a digital computer, the signal paths that carry commands from the instruction decode logic to various different functional units such as the ALU, memory address register, memory data register and other buffers. Named by analogy with the address bus and data bus, each of which carries a set of related signals, the signals […]

Disclaimer: Control definition / meaning should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. All content on this website is for informational purposes only.