- a Latin hymn on the Day of Judgment, commonly sung in a Requiem Mass.
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- Christianity a famous Latin hymn of the 13th century, describing the Last Judgment. It is used in the Mass for the dead
- a musical setting of this hymn, usually part of a setting of the Requiem
literally: day of wrath
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for dies irae
Online Etymology Dictionary, © 2010 Douglas Harper