sine die I. \ˌsīnēˈdīˌē, -nə̇ˈd-, ÷ -dī also ˌsin-; ˌsi](ˌ)nāˈdēˌā, ˌsē], ]nēˈd-, ]nə̇ˈd-, -diˌā\adverb Etymology: Latin : without any future date being designated (as for resumption) : indefinitely < declared the House adjourned sine die — Hodding Carter > II. adjective : made without any future date being designated (as for resumption) : indefinite < favored an adjournment sine die of Congress >