noun
[ U ] ( BrE , law ) a state in which a person who is accused of a crime is not considered to be responsible for their actions, because they are mentally ill :
He was found not guilty of murder on the grounds of diminished responsibility.
noun
[ U ] ( BrE , law ) a state in which a person who is accused of a crime is not considered to be responsible for their actions, because they are mentally ill :
He was found not guilty of murder on the grounds of diminished responsibility.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005