Meaning of INSANITY in English

INSANITY

[noun] [U]He was found not guilty of murder by reason of insanity.Since the killings last May Mr Popper had pleaded temporary insanity.He suffered from periodic bouts of insanity.(figurative) The match became more and more violent, almost to the point of insanity.

Cambridge English vocab.      Кембриджский английский словарь.