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The Collaborative International Dictionary of English v.0.48 (gcide)

Professor \Pro*fess"or\, n. [L., a teacher, a public teacher:
cf. F. professeur. See {Profess}.]
1. One who professed, or makes open declaration of, his
sentiments or opinions; especially, 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.
"Professors of religion." --Bacon.
[1913 Webster]

2. One who professed, or publicly teaches, any science or
branch of learning; especially, an officer in a
university, college, or other seminary, whose business it
is to read lectures, or instruct students, in a particular
branch of learning; as a professor of theology, of botany,
of mathematics, or of political economy.
[1913 Webster]