[verb]

To walk alongside a fellow believer in order to encourage them in their faith and to train them to obey Jesus.

[noun]

A devoted follower of Jesus who seeks to obey Him and participate in His work, and to grow into His likeness.

"Someone who is following Jesus, being changed by Jesus, and is committed to the mission of Jesus."  (Exponential)

From Ed Gross, "Are you a Christian or a Disciple?" a disciples is a follower who:

1. Obeys the commands of their rabbi.
2. Memorizes all of their rabbi's teachings to retell others.
3. Founded in old Testaments and know their rabbi's teaching about it.
4. Imitates their rabbi's way of doing things and fully adopt his mission.
5. When released, make disciples of others in the same way that your rabbi did of you.