irrevocable

final and unalterable 
Found on http://www.graduateshotline.com/list.html

irrevocable

[adj] - impossible to retract or revoke
Found on http://www.webdictionary.co.uk/definition.php?query=irrevocable

Irrevocable

Ir·rev'o·ca·ble adjective [ Latin irrevocabilis : confer French irrévocable . See In- not, and Revoke , and confer Irrevocable .] Incapable of being recalled or revoked; unchangeable; irreversible; unalterable; as, an irrevocable promise or decree; ir...
Found on http://www.encyclo.co.uk/webster/I/99

irrevocable

irrevokable adjective incapable of being retracted or revoked; `firm and irrevocable is my doom`- Shakespeare
Found on https://www.encyclo.co.uk/local/20974

Irrevocable

• (a.) Incapable of being recalled or revoked; unchangeable; irreversible; unalterable; as, an irrevocable promise or decree; irrevocable fate.
Found on http://thinkexist.com/dictionary/meaning/irrevocable/

irrevocable

irrevocable 1. Impossible to revoke, to undo, or to change. 2. That which is impossible to retract or to revoke.
Found on http://www.wordinfo.info/words/index/info/view_unit/2320/3

irrevocable

Cannot be revoked, withdrawn or cancelled except by mutual agreement of the parties. Particularly applies to Letters of Credit.
Found on http://www.londontrade.co.uk/?p=glossary:I
No exact match found