Control-group definition

A group that serves as the control in a scientific experiment; specif., such a group that does not receive the substance, drug, treatment, etc. being tested.
noun
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A group used as a standard of comparison in a controlled experiment.
noun
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The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.

An example of a control group is the people in a clinical trial who do not get to try out the brand new drug that is being tested.

noun
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(in an experiment) The group of test subjects left untreated or unexposed to some procedure and then compared with treated subjects in order to validate the results of the test.
noun
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Other Word Forms

Noun

Singular:
control-group
Plural:
control groups