One who professed, or publicly teaches, any science or branch of learning; especially, an officer in a university, college, or other seminary, whose business it is to read lectures, or instruct students, in a particular branch of learning; as a professor of theology, of botany, of mathematics, or of political economy.

A teacher at a college (often tenured). See Tenure.

University teacher who has completed a Habilitation and enjoys life-time tenure.

A senior member of the academic teaching staff.