/ Dictionary / Index H Hasan: Meaning and Definition of Find definitions for: Ha•san Pronunciation: (hä'sun, ha-san'), [key] — n. a.d. 624?–669?, Arabian caliph: son of Ali and Fatima (brother of Hussein). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hasa Hasanlu Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language