Pronunciation: (pru-fes'ur),[key] —n. 1. a teacher of the highest academic rank in a college or university, who has been awarded the title Professor in a particular branch of learning; a full professor: a professor of Spanish literature. 2. any teacher who has the rank of professor, associate professor, or assistant professor.
3. a teacher.
4. an instructor in some art or skilled sport: a professor of singing; a professor of boxing. 5. a person who professes his or her sentiments, beliefs, etc.