sine diePronunciation: /ˌsiːneɪ ˈdiːeɪ, ˌsʌɪnɪ ˈdʌɪiː/Definition of sine die adverb (with reference to business or proceedings that have been adjourned) with no appointed date for resumption:the case was adjourned sine dieOrigin:Latin, literally 'without a day'sine die in other Oxford dictionaries Definition of sine die in the US English dictionary