PROFESS'OR, noun [Latin] One who makes open declaration of his sentiments or opinions; particularly, one who makes a public avowal of his belief in the Scriptures and his faith in Christ, and thus unites himself to the visible church.

1. One that publicly teaches any science or branch of learning; particularly, an officer in a university, college or other seminary, whose business is to read lectures or instruct students in a particular branch of learning; as a professor of theology or mathematics.