Breadcrumb Home > Dictionary > Index A assistant professor: Meaning and Definition of Find definitions for: assis'tant profes'sor Pronunciation: [key] a teacher in a college or university who ranks above an instructor and below an associate professor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. assistant assistantship ✖ Related Content Daily Word Quiz: musth Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language