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a. Apostle One of a group made up especially of the 12 disciples chosen by Jesus to preach the gospel.
b. A missionary of the early Christian Church.
c. A leader of the first Christian mission to a country or region.
2. One of the 12 members of the administrative council in the Mormon Church.
a. One who pioneers an important reform movement, cause, or belief: an apostle of conservation.
b. A passionate adherent; a strong supporter.
[Middle English, from Old English apostol and from Old French apostle, both from Late Latin apostolus, from Greek apostolos, messenger, from apostellein, to send off : apo-, apo- + stellein, to send; see stel- in Indo-European roots.]
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.
the position or duty of an apostle
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014