an officer in command of a military establishment
person in charge, female or male
of the same kind, class etc; a man or a boy; a friend
male or female colleague, friend
a wise and trusted adviser and helper
person who advises
Professor
person who teaches college courses
a university teacher at the highest level
person who teaches college courses
a private teacher of a single pupil or a very small class; (GB) a university teacher who advises and guides a student
person who teaches another privately