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diminished capacity n1 : an abnormal mental condition that renders a person unable to form the specific intent necessary for the commission of a crime (as first-degree murder) but that does not amount to insanity called also diminished responsibility partial insanity compare insanity, irresistible impulse test, m'naghten test, substantial capacity test
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.