a chronic or persistent disorder of the mental processes caused by brain disease or injury and marked by memory disorders, personality changes, and impaired reasoning.
Loss of cognitive abilities, including memory, concentration, communication, planning, and abstract thinking, resulting from brain injury or from a disease such as Alzheimer's disease or Parkinson's disease. It is sometimes accompanied by emotional disturbance and personality changes.
[Latin dēmentia, madness, from dēmēns, dēment-, senseless; see dement.]
dementia (dɪˈmɛnʃə; -ʃɪə)
(Pathology) a state of serious emotional and mental deterioration, of organic or functional origin
[C19: from Latin: madness; see dement]
(dɪˈmɛn ʃə, -ʃi ə)
de•men•tia (dɪˈmɛn ʃə, -ʃi ə)
severely impaired memory and reasoning ability, usu. with disturbed behavior, associated with damaged brain tissue.
[1800–10; < Latin dēmentia madness <dē-de- + mēns mind + -ia-ia]