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1. the governing or limitation of certain objects, events, or physical responses.
2. a standard against which experimental observations may be evaluated, as a procedure identical to the experimental procedure except for the absence of the one factor being studied.
3. conscious restraint and regulation of impulses and suppression of instincts and affects.
4. a patient or group differing from the case or treated group under study by lacking the disease or by having a different or absent treatment or regimen. The controls and subjects usually otherwise have certain similarities to allow or enhance comparison between them.
automatic brightness control an automated exposure device used in radiology; it senses light and adjusts itself to produce a predetermined fluoroscopic density.
automatic exposure control a timer by which the exposure of x-ray film is determined by the radiographer but the length of exposure is determined by the equipment.
aversive control in behavior therapy, the use of unpleasant stimuli to change undesirable behavior.
birth control see birth control.
hemorrhage control in the nursing interventions classification, a nursing intervention defined as reduction or elimination of rapid and excessive blood loss.
infection control see infection control.
infection control: intraoperative in the nursing interventions classification, a nursing intervention defined as preventing nosocomial infection in the operating room.
motor control the generation and coordination of movement patterns to produce function; it may either control movements of the body in space or stabilize the body in space. See also postural control.
postural control motor control that stabilizes the body in space by integrating sensory input about body position (somatosensory, visual, and vestibular input) with motor output to coordinate the action of muscles and keep the body's center of mass within its base of support. An important aspect of postural control is the righting reactions. Called also balance.
stimulus control any influence exerted by the environment on behavior.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. To regulate, restrain, correct, or restore to normal.
2. Ongoing operations or programs aimed at reducing a disease.
3. Members of a comparison group who differ in disease experience or allocation to a regimen from the subjects of a study.
4. In statistics, to adjust or take into account extraneous influences.
5. A necessary aspect of an experiment serving as a standard of comparison. A control differs from other aspects of an experiment by a single variable.
6. The regulation of a biochemical process, system, pathway, or reaction.
[Mediev. L. contrarotulum, a counterroll for checking accounts, fr. L. rotula, dim. of rota, a wheel]
Farlex Partner Medical Dictionary © Farlex 2012


1. To verify or regulate a scientific experiment by conducting a parallel experiment or by comparing with another standard.
2. To hold in restraint; check.
3. To reduce or prevent the spread of.
1. A standard of comparison for checking or verifying the results of an experiment.
2. An individual or group used as a standard of comparison in a scientific experiment, as a group of subjects given an inactive substance in an experiment testing a new drug administered to another group of subjects.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


noun A comparator against which a therapy in a clinical trial is evaluated—e.g., concurrent controls (placebo, no treatment, dose-response, active) or external controls (historical, published literature and meta-analysis).

The trial protocol incorporates scientific rationale for selecting the comparator and describes how it serves as a reference point for evaluation.

noun The processes or operations intended to ensure authenticity, integrity and confidentiality of electronic records.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


Clinical research Control subject A nontreated or 'negative' individual in a study who serves as a reference. See Concurrent nonrandomized control, Control population, Control subject, Historical control Epidemiology In a case-control study, a comparison group of persons without disease Lab medicine A specimen with known or standardized values for an analyte, that is processed in tandem with an unknown specimen; the 'control' specimen is either known to have the substance being analyzed, ie 'positive' control or known to lack the substance of interest, ie 'negative' control. See Negative control, Positive control, Quality control Psychology The degree to which a person can limit or modify verbal or physical responses to external stimuli. See Administrative control, Impulse control.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. (v.) To regulate, restrain, correct, restore to normal.
2. (n.) Ongoing operations or programs aimed at reducing a disease.
3. (n.) Members of a comparison group who differ in disease experience or allocation to a regimen from the subjects of a study.
4. (v). statistics To adjust or take into account extraneous influences.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


  1. an experiment carried out to afford a standard of comparison for other experiments, e.g. where the effect of a nutrient substance on a plant is being tested, control plants are grown in exactly similar conditions but without the addition of the nutrient substance.
  2. (also calledpara population control) the limitation by man of numbers of harmful plants or animals by artificial means, e.g. spraying with chemicals, poisoning, shooting or by seminatural means such as BIOLOGICAL CONTROL. See also REGULATION (2).
  3. (control system) a system that regulates a chemical process such as thyroxine production. See FEEDBACK MECHANISM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


To regulate, restrain, correct, or restore to normal.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about control

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Q. BIRTH CONTROL how many types are there?

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More discussions about control
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References in periodicals archive ?
To examine the relationships between proactive coping style, proactive competence, and organization entry appraisals (i.e., challenge, threat, and controllability appraisals), we evaluated the hypothesized model (Figure 1) using structural equation modeling (SEM) with the maximum likelihood estimation method, implemented in SPSS Amos 24 (IBM Corp., Armonk, NY).
Kalman controllability theory provides great convenience for checking whether or not a given network is controllable.
In this paper, we are concern on the exact null controllability, stability, stabilizability, complete stabilizability, detectability, and possible relationship among them.
A necessary and sufficient condition for the controllability of system (2) is given by the following.
The rank of the controllability matrix is computed for each update of K.
Matrices A and B of the above system (17) are controllable if and only if the controllability Gramian matrix [G.sub.c](T) on horizon T defined as (21) has full rank n and is positive definite.
Construct the controllability matrix [??] and observability matrix [??].
Although it is clear that intravitreal steroid therapy was performed for reduction of ME and as a pretreatment before MLP [16], no quantitative analysis of MLP controllability was performed, and no retinal assessment was performed on the presence and intensity of retinal edema (expressed as central retinal thickness) at the time of MLP.
The functional equation (2) is called approximate controllability on [0,c] if [bar.K(c, [y.sub.0])] = X.
Russell, "Controllability and stabilizability theory for linear partial differential equations: recent progress and open questions," SIAM Review, vol.
Our main work is to check the controllability and observability of this model for normal and diabetic patient.

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