What does “Apostle” mean?

Apostle (αποστολος, [apostolos, literally, “one sent forth,” an envoy, missionary): For the meaning of this name as it meets us in the New Testament, reference is sometimes made to classical and Jewish parallels. In earlier classical Greek there was a distinction between an aggelos or messenger and an apostolos, who was not a mere messenger, but a delegate or representative of the person who sent him. In the later Judaism, again, apostoloi were envoys sent out by the patriarchate in Jerusalem to collect the sacred tribute from the Jews of the Dispersion. It seems unlikely, however, that either of these uses bears upon the Christian origin of a term which, in any case, came to have its own distinctive Christian meaning. To understand the word as we find it in the New Testament it is not necessary to go beyond the New Testament itself. To discover the source of its Christian use it is sufficient to refer to its immediate and natural signification. The term used by Jesus, it must be remembered, would be Aramaic, not Greek, and apostolos would be its literal equivalent.

This biblical study was taken from the International Standard Bible Encyclopedia Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co