assassin /əˈsæsɪn/noun 4verb 1forms 3 noun4 •a person whose work is killing leaders and other famous people, usually in secretWhat has violence ever accomplished? What has it ever created? No martyr's cause can ever be stilled by an assassin’s bullet. — 1968 •Any ruthless killer. •(historical) A member of the Nizari Ismaili Muslim community of the Alamut Period. •(humorous) An associated prime of a module. verb1 •(nonstandard) To assassinate. formsassassined · assassining · assassins