Definition of Ali Baba from the Oxford Advanced Learner's Dictionary

 

Ali Baba

 
BrE
 
; NAmE
 
 
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a character in an old Arabian story who hears some thieves say 'Open Sesame!’, the magic words that open the door of the cave where they keep everything they have stolen. He steals their gold and they try to kill him, but he is saved by his servant Morgiana. The story is popular as a pantomime in Britain.
See the Oxford Advanced American Dictionary entry: Ali Baba