1. a mental condition in which memory, thinking, and reasoning abilities are severely impaired, typically due to brain disease or injury
Usage: medical

Examples

• Her grandmother was diagnosed with dementia last year.
• Alzheimer’s disease is the most common cause of dementia.
• The nursing home specializes in caring for patients with dementia.
• Early signs of dementia include memory loss and confusion.
• Researchers are working to find better treatments for dementia.
• The family struggled to cope with their father’s advancing dementia.