Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

dementia

play
noun de·men·tia \di-ˈmen(t)-shə, -shē-ə\

Simple Definition of dementia

  • medical : a mental illness that causes someone to be unable to think clearly or to understand what is real and what is not real

Full Definition of dementia

  1. 1 :  a usually progressive condition (as Alzheimer's disease) marked by deteriorated cognitive functioning often with emotional apathy

  2. 2 :  madness, insanity <a fanaticism bordering on dementia>

de·men·tial play \-shəl\ adjective

Examples of dementia

  1. This patient suffers from dementia.

  2. a new study on age-related dementias



Origin of dementia

Latin, from dement-, demens mad, from de- + ment-, mens mind — more at mind


First Known Use: 1806


Medical Dictionary

dementia

play
noun de·men·tia \di-ˈmen-chə\

Medical Definition of dementia

  1. :  a usually progressive condition (as Alzheimer's disease) marked by the development of multiple cognitive deficits (as memory impairment, aphasia, and inability to plan and initiate complex behavior)

  2. de·men·tial \-chəl\play adjective





Seen and Heard

What made you want to look up dementia? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 13, 2016

a trying or distressing experience

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

196.5 pounds 2.2 pounds 100 pounds 16.96 pounds
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ