control

Definition

verb
  1. to have the ability or authority to direct someone or something
    Example Sometimes we need help to control people who think they have waited too long.
  2. to limit or restrain something
    Example administered drugs to control the pain
noun
  1. the ability or authority to control something
    Examples After her stroke she had no control over her left arm. • The administrators are in control of the admissions policy.
  2. a person or group whose test data are used as a comparison in a study
  3. a comparison in a study
Medical-Glossary.com
www.medical-glossary.com/definition/control.html