Back to Pegasus definition listing Choose a year from the dropdown to view that year's definition 2009 2011 2009 2007 2003 2002 2001 2000 1999 1998 Deafness Date: July 2009 Definition: Permanent and irreversible loss of hearing to the extent that the loss is greater than 95 decibels across all frequencies in the better ear using a pure tone audiogram.No change since April 2007 Definition update history: Deafness May 2011 Deafness July 2009 Deafness April 2007 Deafness November 2003 Deafness May 2003 Deafness March 2003 Deafness April 2002 Deafness July 2001 Deafness November 2000 Deafness November 1999 Deafness July 1999 Deafness February 1998 Share this by email Back to Pegasus definition listing