control experiment

noun
an experiment in which the variables are controlled so that the effects of varying one factor at a time may be observed.

Origin:
1870–75

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World English Dictionary
control experiment
 
n
an experiment designed to check or correct the results of another experiment by removing the variable or variables operating in that other experiment. The comparison obtained is an indication or measurement of the effect of the variables concerned

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

control experiment n.
An experiment that isolates the effect of one variable on a system by holding constant all variables but the one under observation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
No, they are the future human population control experiment.
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