apostle
US /əˈpɑː.səl/
UK /əˈpɑː.səl/
1.
each of the twelve chief disciples of Jesus Christ.
:
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Peter, James, and John were among the original apostles.
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The teachings of the apostles form the foundation of Christianity.
2.
a passionate advocate or supporter of a new cause or idea.
:
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She became an apostle of environmental protection.
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He was a true apostle of peace and justice.