assassinate UK /əˈsæsɪneɪt/US /əˈsæs(ə)nˌeɪt/noun 2verb 2forms 3 noun2 •(no longer used) Assassination, murder.Mor. Why? if I had made an assassinate upon your Father; vitiated your Mother: ravished your Sisters― Tru. I would kill you, Sir, I would kill you, if you had. Mor. Why? you do more in this, Sir: it were a vengeance centuple, for all facinorous Acts, that could be nam'd, to do that you do. •(no longer used) An assassin.Yet again, many of them desperat hairebraines, rash, carelesse, fit to be Assasinates, as being voide of all Feare and Sorrow […] — 1624 verb2 •To murder someone, especially an important person, by a sudden or obscure attack, especially for ideological or political reasons. •(figurative) To harm, ruin, or defame severely or destroy by treachery, slander, libel, or obscure attack.He assassinated his rival's character. formsassassinated · assassinating · assassinates