[dih-men-shuh, -shee-uh]
noun Psychiatry.
severe impairment or loss of intellectual capacity and personality integration, due to the loss of or damage to neurons in the brain.

1800–10; < Latin dēmentia madness, equivalent to dēment- out of one's mind (see dement) + -ia noun suffix

demential, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dementia (dɪˈmɛnʃə, -ʃɪə)
a state of serious emotional and mental deterioration, of organic or functional origin
[C19: from Latin: madness; see dement]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1806, L. noun of state from dementem, from dementer (see dement). It existed earlier in an anglicized form, demency (1520s), from Fr. démence. Dementia præcox is a Mod.L. form recorded from 1899 in Eng., 1891 in Ger., from Fr. démence précoce (1857). See precocious
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dementia de·men·tia (dĭ-měn'shə)
Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain, and often accompanied by emotional disturbance and personality changes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dementia   (dĭ-měn'shə)  Pronunciation Key 
Deterioration of intellectual faculties, such as memory, concentration, and judgment, sometimes accompanied by emotional disturbance and personality changes. dementia is caused by organic damage to the brain (as in alzheimer's disease), head trauma, metabolic disorders, or the presence of a tumor.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
You draw parallels between your own struggle to reconstruct your memories and
  your mother's decline into dementia.
As we age, parts of the brain tend to shrink—even in the absence of
  neurocognitive diseases, such as dementia or Alzheimer's.
The medical experts said age-related dementia, most notably Alzheimer's
  disease, is the price we're paying for staying healthy.
That's important, since dementia and other problems associated with aging can
  increase feelings of paranoia.
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