assassination Syllabification: (as·sas·si·na·tion)Pronunciation: /əˌsasəˈnāSHən/Translate assassination | into French | into German | into Italian | into Spanish Definition of assassination noun the action of assassinating someone:the assassination of President Kennedy [as modifier]:a failed assassination attempt a wave of bombings and assassinationsassassination in other Oxford dictionaries Definition of assassination in the British & World English dictionary