From pais and a reduplicated form of ago; a boy-leader, i.e. A servant whose office it was to take the children to school; (by implication, (figuratively) a tutor ("paedagogue")) -- instructor, schoolmaster.
KJV: For though ye have ten thousand instructors in Christ, yet have ye not many fathers: for in Christ Jesus I have begotten you through the gospel.
NASB: For if you were to have countless tutors in Christ, yet you would not have many fathers, for in Christ Jesus I became your father through the gospel.