Meaning of "forgetfulness and dementia"

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.

de·men·tia

dĭ-mĕn′shə
de·men·tia  (dĭ-mĕn′shə)
n.
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.]

de·men′tial adj.

dementia

dɪˈmɛnʃə; -ʃɪə
dementia (dɪˈmɛnʃə; -ʃɪə)
n
(Pathology) a state of serious emotional and mental deterioration, of organic or functional origin
[C19: from Latin: madness; see dement]

de•men•tia

(dɪˈmɛn ʃə, -ʃi ə)
de•men•tia (dɪˈmɛn ʃə, -ʃi ə) n.
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]
de•men′tial, adj.
dementia
madness or insanity. Cf. amentia.
See also: Insanity