/ Dictionary / Index S SSE: Meaning and Definition of Find definitions for: SSE Pronunciation: [key] south-southeast. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sse (Thesaurus) SS.D. SSI Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language