vt, con*trolled  con*trol*ling  1  :  to incorporate suitable controls in <a controlled experiment>   2  :  to reduce the incidence or severity of esp. to innocuous levels < an insect population>  <a vaccine for controlling outbreaks of cholera> 
n 1  :  an act or instance of controlling something < of acute intermittent porphyria>   2  :  one that is used in controlling something: as  a  :  an experiment in which the subjects are treated as in a parallel experiment except for omission of the procedure or agent under test and which is used as a standard of comparison in judging experimental effects - called also control experiment   b  :  one (as an organism, culture, or group) that is part of a control .
 
 
 
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