/ Dictionary / Index S self-possession: Meaning and Definition of Find definitions for: self-pos•ses•sion Pronunciation: (self'pu-zesh'un, self"-), [key] — n. the quality of being self-possessed; control of one's feelings, behavior, etc.; composure; poise. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: self-possession (Thesaurus) self-possessed self-preservation Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language