/ Dictionary / Index S SEP: Meaning and Definition of Find definitions for: SEP Pronunciation: [key] simplified employee pension. Sep. Pronunciation: [key] September. Septuagint. sep. Pronunciation: [key] sepal. separable. separate. separated. separation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sep (Thesaurus) Seoul sepal Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language