From Longman Dictionary of Contemporary Englishcontrolled experimentconˌtrolled exˈperiment noun [countable] TEST/EXPERIMENTa scientific test done in a place where you can control all the things that might affect the test a controlled experiment to determine the effects of light on plant growth
Examples from the Corpus
controlled experiment• This has not yet been measured by a properly controlled experiment.• Two of the four specimens known to be infected with M tuberculosis were positive in the controlled experiment. 