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90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
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I was waiting outside Professor Hertz's office.
a biology/geography professor
a professor of English/physics
In 1963 he was appointed professor of history.
This is the American English definition of professor. View British English definition of professor.