sine die
Concise Oxford English Dictionary © 2008 Oxford University Press:
sine die /ˌsiːneɪ ˈdiːeɪ, ˌsʌɪnɪ ˈdʌɪiː/
▶adverb (with reference to an adjournment) with no appointed date for resumption.
– origin L., lit. ‘without a day’.
'sine die' also found in these Oxford entries:

