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terce(tûrs) also tierce (tîrs)
1. The third of the seven canonical hours. No longer in liturgical use.
2. The time of day appointed for this service, usually the third hour after sunrise.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Roman Catholic Church) chiefly RC Church the third of the seven canonical hours of the divine office, originally fixed at the third hour of the day, about 9 a.m.
[a variant of tierce]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the third of the seven canonical hours.
[1350–1400; Middle English terse, tierce tierce]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.