/ Dictionary / Index S sepn.: Meaning and Definition of Find definitions for: sepn. Pronunciation: [key] separation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sepiolite sepoy Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language