The Collaborative International Dictionary of English v.0.48:

Disciple \Dis*ci"ple\, v. t. [imp. & p. p. Discipled; p. pr. &
   vb. n. Discipling.]
   1. To teach; to train. [Obs.]
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            That better were in virtues discipled. --Spenser.
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   2. To punish; to discipline. [Obs.] --B. Jonson.
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   3. To make disciples of; to convert to doctrines or
      principles. [R.]
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            Sending missionaries to disciple all nations. --E.
                                                  D. Griffin.
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The Collaborative International Dictionary of English v.0.48:

Disciple \Dis*ci"ple\, n. [OE. disciple, deciple, OF. disciple,
   fr. L. discipulus, fr. discere to learn (akin to docere to
   teach; see Docile) + prob. a root meaning to turn or drive,
   as in L. pellere to drive (see Pulse).]
   One who receives instruction from another; a scholar; a
   learner; especially, a follower who has learned to believe in
   the truth of the doctrine of his teacher; an adherent in
   doctrine; as, the disciples of Plato; the disciples of our
   Savior.
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   The disciples, or The twelve disciples, the twelve
      selected companions of Jesus; -- also called the
      apostles.

   Disciples of Christ. See Christian, n., 3, and
      Campbellite.

   Syn: Learner; scholar; pupil; follower; adherent.
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WordNet (r) 3.0 (2006):

disciple
    n 1: someone who believes and helps to spread the doctrine of
         another [syn: disciple, adherent]