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 the Appendix of Indo-European roots.]
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