<p><strong>Verb</strong></p><ul><li>To exercise restraint or direction over; dominate; command: The car is difficult to control at high speeds. That zone is controlled by enemy troops.</li><li>To hold in check; curb: to control a horse; to control one's emotions.</li><li>To test or verify (a scientific experiment) by a parallel experiment or other standard of comparison.</li><li>To eliminate or prevent the flourishing or spread of: to control a forest fire.</li><li>(Of an organism) to initiate an internal response to external stimuli.</li><li>Obsolete: to check or regulate (transactions), originally by means of a duplicate register.</li></ul><p><strong>Noun</strong></p><ul><li>The act or power of controlling; regulation; domination or command: Who's in control here?</li><li>The situation of being under the regulation, domination, or command of another: The car is out of control.</li><li>Check or restraint: Her anger is under control.</li><li>A legal or official means of regulation or restraint: to institute wage and price controls.</li><li>Statistics: control variable.</li><li>A person who acts as a check; controller.</li><li>A device for regulating and guiding a machine, as a motor or airplane.</li><li>Prevention of the flourishing or spread of something undesirable: rodent control.</li><li>Biology: an organism’s ability to initiate an internal response to external stimuli (regulation).</li><li>Baseball: the ability of a pitcher to throw the ball into the strike zone consistently: The rookie pitcher has great power but no control.</li><li>Philately: any device printed on a postage or revenue stamp to authenticate it as a government issue or to identify it for bookkeeping purposes.</li><li>A spiritual agency believed to assist a medium at a séance.</li><li>The supervisor to whom an espionage agent reports when in the field.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>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.</li></ul>