(1):

(n.) A slave who led his master's children to school, and had the charge of them generally.

(2):

(n.) A teacher of children; one whose occupation is to teach the young; a schoolmaster.

(3):

(n.) One who by teaching has become formal, positive, or pedantic in his ways; one who has the manner of a schoolmaster; a pedant.

(4):

(v. t.) To play the pedagogue toward.