dementia

noun de·men·tia \ di-ˈmen(t)-shə , -shē-ə \
Updated on: 6 Dec 2017

Definition of dementia

1 : a usually progressive condition (such as Alzheimer's disease) marked by the development of multiple cognitive deficits (such as memory impairment, aphasia, and the inability to plan and initiate complex behavior)
  • dementia is diagnosed only when both memory and another cognitive function are each affected severely enough to interfere with a person's ability to carry out routine daily activities.
  • The Journal of the American Medical Association
2 : madness, insanity
  • a fanaticism bordering on dementia

demential

play \-shəl\ adjective

Examples of dementia in a Sentence

  1. This patient suffers from dementia.

  2. a new study on age-related dementias

Recent Examples of dementia from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'dementia.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of dementia

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


Medical Dictionary

dementia

noun de·men·tia \ di-ˈmen-chə \

medical Definition of dementia

: 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)

demential

play \-chəl\ 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).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

of or relating to dancing

Get Word of the Day daily email!

Test Your Vocabulary

Star Wars Words Quiz

  • cu-jedi-training
  • The bounty portion of bounty hunters (such as Boba Fett) comes from a Latin word meaning
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Dictionary Devil

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

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!