Strong's G3100 — μαθητεύω (verb)
matheteuo (math-ayt-yoo'-o) v.
1. (intransitively) to become a pupil
2. (transitively) to disciple, i.e. enrol as scholar
[from G3101]
KJV: be disciple, instruct, teach 
Root(s): G3101 
Compare: G1321 
Hebrew root: μαθητής
Occurrences: 4