Definition of assassin noun from the Oxford Advanced Learner's Dictionary

 

assassin

 noun
noun
BrE BrE//əˈsæsɪn//
 
; NAmE NAmE//əˈsæsn//
 
Terrorism
 
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a person who murders somebody important or famous, for money or for political reasons a hired/professional assassin He was killed by a hired assassin. They hired a professional assassin to do the job for them. See related entries: Terrorism Word Origin mid 16th cent.: from French, or from medieval Latin assassinus, from Arabic ḥašīšī ‘hashish-eater’.
See the Oxford Advanced American Dictionary entry: assassin