WordNet (r) 3.0 (2006):

Ali
    n 1: United States prizefighter who won the world heavyweight
         championship three times (born in 1942) [syn: Ali,
         Muhammad Ali, Cassius Clay, Cassius Marcellus Clay]
    2: the fourth caliph of Islam who is considered to be the first
       caliph by Shiites; he was a cousin and son-in-law of
       Muhammad; after his assassination Islam was divided into
       Shiite and Sunnite sects