/ Dictionary / Index S subprincipal: Meaning and Definition of Find definitions for: sub•prin•ci•pal Pronunciation: (sub-prin'su-pul, sub'prin"-), [key] — n. an assistant or deputy principal. (in an organ) a subbass of the open diapason class. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subprime subprofessional Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language