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Definition of Control group
1. Noun. (context: 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. ¹
¹ Source: wiktionary.com
Medical Definition of Control group
1. A group of subjects participating in the same experiment as another group of subjects, but which is not exposed to the variable under investigation. See: experimental group. (05 Mar 2000)