A college or university teacher who ranks above an associate professor.
A teacher or instructor.
One who professes.
[Middle English professour, from Old French professeur, from Latin professor, from professus, past participle of profitērī, to profess; see profess.] pro'fes·so'ri·al (prō'fĭ-sôr'ē-əl, -sōr'-, prŏf'ĭ-) adj., pro'fes·so'ri·al·ly adv., pro·fes'sor·ship' n.