Disciple is from Latin discipulus—pupil, from discere, to learn, also denotes disciplined learning by a follower. From discipline: training expected to produce a specific character or pattern of behavior, especially training that produces moral or mental improvement. Controlled behavior resulting from disciplinary training; self-control.
Original Biblical usage in the Greek New Testament is distinctly different from the Latin understanding. The Greek μαθετης (mathetis) originally simply meant a pupil or someone who learns (from matheno). With regards to Jesus' original fellowship, it refers to a close continual teacher/student relationship where learning is greatly emphasised.