/ Dictionary / Index S SE: Meaning and Definition of Find definitions for: SE Pronunciation: [key] southeast. southeastern. Standard English. Se Pronunciation: [key] — Symbol, Chem. selenium. se- Pronunciation: [key] a prefix occurring in loanwords from Latin, where it meant “apart”: seduce; select. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: se (Thesaurus) SDS sea 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