/ Dictionary / Index T theirself: Meaning and Definition of Find definitions for: their•self Pronunciation: (âr"self'), [key] — pron. Nonstandard. themselves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. theirs theism Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language