/ Dictionary / Index U underclassman: Meaning and Definition of Find definitions for: un•der•class•man Pronunciation: (un"dur-klas'mun, -kläs'-), [key] — pl. -men. a freshman or sophomore in a secondary school or college. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underclassman (Thesaurus) underclass underclothes Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language