Emily Dickinson Lexicon

PRO-FESS'OR, n. [L.]

1. 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. – Bacon. Hammond.
2. 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.