/ Dictionary / Index S self-possessed: Meaning and Definition of Find definitions for: self-pos•sessed Pronunciation: (self'pu-zest', self"-), [key] — adj. having or showing control of one's feelings, behavior, etc.; composed; poised. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: self-possessed (Thesaurus) self-portrait self-possession Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language