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.
any teacher who has the rank of professor, associate professor, or assistant professor.
a teacher.
an instructor in some art or skilled sport: a professor of singing; a professor of boxing.
a person who professes his or her sentiments, beliefs, etc.

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

professorial [proh-fuh-sawr-ee-uhl, -sohr-, prof-uh-] , adjective
professorialism, noun
professorially, adverb
nonprofessorial, adjective
nonprofessorially, adverb
pseudoprofessorial, adjective
subprofessor, noun
unprofessorial, adjective
unprofessorially, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
professor (prəˈfɛsə)
1.  the principal lecturer or teacher in a field of learning at a university or college; a holder of a university chair
2.  chiefly (US), (Canadian) associate professor assistant professor See also full professor any teacher in a university or college
3.  a person who claims skill and instructs others in some sport, occupation, etc
4.  a person who professes his opinions, beliefs, etc
[C14: from Medieval Latin: one who has made his profession in a religious order, from Latin: a public teacher; see profess]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1380, from L. professor "person who professes to be an expert in some art or science, teacher of highest rank," agent noun from profitieri "lay claim to, declare openly" (see profess). As a title prefixed to a name, it dates from 1706. Short form prof is recorded from
1838. Professorial (1713) is from L.L. professorius "pertaining to a public teacher."
Online Etymology Dictionary, © 2010 Douglas Harper
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