D: noun: 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. Related words: lecturer, assistant, fellow, tutor, educator, instructor, teacher, principal, pundit, sage, egghead, savant, brain, pedagogue, prof, quant. Origin: 1350–1400; Middle English < Medieval Latin prōfessor one who has taken the vows of a religious order, Latin: a public lecturer, equivalent to prō- pro-1 + -fet-, combining form of fatērī to acknowledge, declare + -tor -tor, with tt > ss. British dictionary: 1. the principal lecturer or teacher in a field of learning at a university or college; a holder of a university chair. 2. mainly US and Canadian. any teacher in a university or college. See also associate professor, assistant professor, full professor. 3. a person who claims skill and instructs others in some sport, occupation, etc. 4. a person who professes his opinions, beliefs, etc. Origin: C14: from Medieval Latin: one who has made his profession in a religious order, from Latin: a public teacher; see profess. MW: 1. one that professes, avows, or declares. 2. a. a faculty member of the highest academic rank at an institution of higher education. b. a teacher at a university, college, or sometimes secondary school. c. one that teaches or professes special knowledge of an art, sport, or occupation requiring skill. Examples of professor in a Sentence: Professor Williams will be teaching the class. First Known Use of professor: 14th century, in the meaning defined at sense 1.