si·ne di·e (sī′nĭ dīē, sĭn′ā dēā′)
Without a day specified for a future meeting; indefinitely: Parliament was dismissed sine die.
[Medieval Latin : Latin sine, without + Latin diē, ablative of diēs, day.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.