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1. a device or mechanism for operating a car, aircraft, etc.
a. a device that regulates the operation of a machine. A dynamic control is one that incorporates a governor so that it responds to the output of the machine it regulates
b. (as modifier): control panel
3. Spiritualism an agency believed to assist the medium in a séance
4. a letter, or letter and number, printed on a sheet of postage stamps, indicating authenticity, date, and series of issue
5. one of a number of checkpoints on a car rally, orienteering course, etc., where competitors check in and their time, performance, etc., is recorded




(religion, spiritualism, and occult)

Control” is the term often used to designate the spirit operator of a séance. A more common name is “guide.” This entity regulates what is happening in terms of which spirits are allowed to come through to the medium, what form of communication is being used (clairvoyance, direct voice, etc.), whether or not such physical phenomena as apports might be apparent, and so on. Some people have more than one guide and the control is the chief one, or the one who is in control of the proceedings at any particular time.

Nandor Fodor said, “The body of the medium is an instrument which requires considerable practice in efficient handling. The control is a communications expert who watches over the fluency of the proceedings, often steps in if he vacated his place to explain confusion and repeats unintelligible expressions. The easygoing, conversational aspect of the séances is largely due to his presence … [the controls] are patient and ready to produce the phenomena to the sitters’ satisfaction. But they do not take orders, expect courteous treatment, appreciation for what they do and have their own caprices.” Controls are not all-knowing. Many times a control will admit to ignorance of a subject, or the answer to a question, and will say that he will ask another who knows.

Not all controls are male, although the majority seems to be. It is not known why this is. Controls often have helpers to assist with such things as the presentation of physical phenomena. These helpers can also aid in the explanation of incoherent messages.

William Stainton Moses recorded some blunders by controls. Once, perfume was supposed to be produced so that the sitters could smell it. Instead, such a terrible odor filled the room that the sitters had to leave. Another time heavy volumes of phosphoric smoke were produced, making the medium believe he was enveloped in fire. Usually when some untoward event such as these takes place, the control immediately orders the end of the session and the medium comes out of trance.


Fodor, Nandor: Encyclopedia of Psychic Science. London: Arthurs Press, 1933


(computer science)
The section of a digital computer that carries out instructions in proper sequence, interprets each coded instruction, and applies the proper signals to the arithmetic unit and other parts in accordance with this interpretation.
A mathematical check used with some computer operations.
(control systems)
A means or device to direct and regulate a process or sequence of events.
An input element of a cryotron.
A test made to determine the extent of error in experimental observations or measurements.
A procedure carried out to give a standard of comparison in an experiment.
Observations made on subjects which have not undergone treatment, to use in comparison with observations made on subjects which have undergone treatment.


Any device for regulating a system or component during its normal (manual or automatic) operation; it is responsive, during automatic operation, to the property (such as pressure or temperature) whose magnitude is to be regulated.


(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.


A program module or routine that enhances the functionality of a program. A control can be as small as a single button on a user interface or as large as a complicated forecasting algorithm. The term is often used with regard to user interface functions such as buttons, menus and dialog boxes. See ActiveX control, AWT, anchor and user interface control.
References in periodicals archive ?
Although Special Operations Forces are working jointly on the operational and strategic levels, they must be able to extend jointness to the tactical level by effectively staffing and training special operations command and control elements.
It is important to identify 'human factor' control elements in the self-assessment exercise.
A firm is required to document its compliance with the five quality control elements.
The central control element of the CarPC in the central console replaces a multitude of buttons, keys and dials, the clear screen design of the display helps drivers to spot the required information at a glance.
electronic fire alarm to other objects, modifying existing systems, fire extinguishing equipment and EPS, EPS interconnection outputs, SHZ, emergency ventilation and CCTV system in order to create an integrated security system through a warehouse superstructure system, move the control elements integrated.
Staying in contact with command and control elements and other combat forces is an integral part of the Longbow mission.
The first presentation is titled "In Vitro Antiviral Activities of Phosphorodiamidate Morpholino Oligomers Targeting Human Rhino Virus 14 Replication and Translational Control Elements.
On site measuring and control elements, sensors and actuators such as pressure transmitters, extinguishing and control valves, sensors of the access control and monitoring of the pumping operation.
With both systems, electronic and hydraulic control elements are combined into an extremely compact unit -- a concept called "hydronic.
Nearly a dozen distinct software elements including session control elements that map to functional IMS components are deployed across multiple SUN servers makes up a distributed ControlSwitch system.
Request for Proposal are invited for the upgrade of the Athens-Clarke County Police Department (ACCPD) door access equipment at each of the department s satellite facilities (to include installation services) such that all access control elements are under one existing access control system.
At the same time, separate software modules for supervisory control and data acquisition (SCADA) and systemwide supervisory control system (SSCS) will control elements such as traction power, ventilation fans, and other safety devices in the MBTA system.