Definition of control
(Entry 1 of 2)
1a : to exercise restraining or directing influence over : regulate control one's anger
b : to have power over : rule A single company controls the industry.
c : to reduce the incidence or severity of especially to innocuous levels control an insect population control a disease
: to incorporate controls in an experiment or study —used with for control for socioeconomic differences
controlnoun, often attributive
Definition of control (Entry 2 of 2)
1a : an act or instance of controlling also : power or authority to guide or manage He took control of the family business.
b : skill in the use of a tool, instrument, technique, or artistic medium a singer's control of her voice
c : the regulation of economic activity especially by government directive —usually used in plural price controlsrent controls
d : the ability of a baseball pitcher to control the location of a pitch within the strike zone
3 : one that controls: such as
a : a device or mechanism used to regulate or guide the operation of a machine, apparatus, or system the controls of the aircraft
b : an organization that directs a spaceflight mission control
c(1) : control experiment
(2) : one (such as an organism, culture, or group) that is part of a control experiment and is used as a standard of comparison … the residents in the experimental group also seemed to have a lower rate of mortality when compared with controls …— Ellen J. Langer and Jerry Avorn —often used before another noun Because patients sometimes get better or worse on their own, drug tests also need a control group to compare the new drug with standard treatment or a placebo.— Marilyn Chase
d : a personality or spirit believed to actuate the utterances or performances of a spiritualist medium
4 or less commonly Control : control key
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