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Related to invitatory: versicle
n. pl. in·vi·ta·to·ries
A psalm or other piece sung as an invitation to prayer in church services, especially at the opening of matins in the Roman office.
Constituting or containing an invitation.
[Middle English invitatorie, from Medieval Latin invītātōrium, from Late Latin invītātōrius, inviting, from Latin invītātus, past participle of invītāre, to invite.]
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.
serving as or conveying an invitation
n, pl -tories
(Ecclesiastical Terms) any of various invitations to prayer, such as Psalm 95 in a religious service
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
in•vi•ta•tor•y(ɪnˈvaɪ təˌtɔr i, -ˌtoʊr i)
serving to invite; conveying an invitation.
[1300–50; Middle English < Late Latin]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.