sine die

[ sahy-nee dahy-ee, sin-ey-dee-ey; Latin si-ne dee-e ]
/ ˈsaɪ ni ˈdaɪ i, ˈsɪn eɪˈdi eɪ; Latin ˈsɪ nɛ ˈdi ɛ /

adverb

without fixing a day for future action or meeting: The assembly adjourned sine die.

Origin of sine die

From the Latin word sine diē without (a fixed) day
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for sine die

sine die

/ Latin (ˈsaɪnɪ ˈdaɪɪ) /

adverb, adjective

without a day fixedan adjournment sine die

Word Origin for sine die

literally: without a day
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012