de·men·tia

[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.

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

de·men·tial, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
dementia (dɪˈmɛnʃə, -ʃɪə) [Click for IPA pronunciation guide]
 
n
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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00:10
Dementia is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

dementia
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)
n.
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
Senile dementia has been around for as long as people have had the means of
  recording it.
At the start of the study, none of the participants showed signs of dementia.
Advanced dementia has often been treated as an amalgamation of symptoms in the
  aging, rather than a deadly illness in itself.
Her husband had Lewy body dementia, a progressive brain disease, she said.
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