Apostle (noun)

1. One of the twelve main disciples of Jesus Christ in Christianity.
2. A person sent on a mission, especially a religious or political one.

Origin:

From the greek word ἀπόστολος (apóstolos) meaning "a messenger" or "one who is sent".

Examples:

1. Paul, Peter and John are considered as the most prominent apostles in Christianity.
2. The word "apostle" comes from the Greek word ἀπόστολος (apóstolos) meaning "a messenger" or "one who is sent".
3. He is considered as an apostle of peace and nonviolence.
4. The apostle's teachings were spread through the early Christian churches.
5. The leader of the movement was considered as an apostle of reform.