ETYM Latin, a preparer: cf. French instructeur.
1. One who instructs; one who imparts knowledge to another; a teacher.
2. A rank beneath assistant professor, at a university; an adjunct professor.

1. Any person (or institution) who acts as an educator.
2. One that disciplines or directs

1. A person whose occupation is teaching; SYN. instructor.
2. A personified abstraction that teaches

ETYM Old Eng. tutour, Latin tutor, from tueri to watch, defend: cf. French tuteur. Related to Tuition.
1. One who gives private lessons to a student, especially as a means of helping the student keep up with his or her classmates.
2. One who guards, protects, watches over, or has the care of, some person or thing; guardian.