noun
: any acute or chronic mental dysfunction (as delirium or senile dementia) resulting chiefly from physical changes in brain structure and characterized especially by impaired cognition
noun
: any acute or chronic mental dysfunction (as delirium or senile dementia) resulting chiefly from physical changes in brain structure and characterized especially by impaired cognition
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012