PRONUNCIATION:

(SY-nee DY-ee, SIN-ay DEE-ay) 

MEANING:

adverb: Without designating a future day for action or meeting; indefinitely.

ETYMOLOGY:

From Latin sine (without) die (day). Earliest documented use: 1631.

USAGE:

“Following the discord, the meeting was adjourned sine die.”
Meet Turns Into Bedlam; The Times of India (New Delhi); Jun 13, 2012.