/ Dictionary / Index S Sian: Meaning and Definition of Find definitions for: Si•an Pronunciation: (sē'än', shē'-), [key] — n. Xian. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sian (Thesaurus) Siamese twins Siangtan Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language