Back to Pegasus definition listing Choose a year from the dropdown to view that year's definition 2003 2011 2009 2007 2003 2002 2001 2000 1999 1998 Dementia Date: March 2003 Definition: Dementia supported by evidence of progressive loss of the ability: to remember, to reason, and to perceive, understand, express and give effect to ideas.No change since February 1998 Definition update history: Dementia May 2011 Dementia July 2009 Dementia April 2007 Dementia November 2003 Dementia May 2003 Dementia March 2003 Dementia April 2002 Dementia July 2001 Dementia November 2000 Dementia November 1999 Dementia July 1999 Dementia February 1998 Share this by email Back to Pegasus definition listing