Definition of controlled experiment noun from the Oxford Advanced Learner's Dictionary


controlled experiment

BrE BrE//kənˌtrəʊld ɪkˈsperɪmənt//
; NAmE NAmE//kənˌtroʊld ɪkˈsperɪmənt//
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a scientific experiment in which only one condition is changed in each of several tests in order to find out what effect that condition has on the results of the experiment Controlled experiments show how shore crabs of different sizes respond to ship noise.
See the Oxford Advanced American Dictionary entry: controlled experiment