resignation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act or an instance of resigning.
• noun An oral or written statement that one is resigning a position or office.
• noun Unresisting acceptance of something as inescapable; submission.

from The Century Dictionary.

• noun The act of resigning or giving up, as a claim, office, place, or possession.
• noun The state of being resigned or submissive; unresisting acquiescence; particularly, quiet submission to the will of Providence; contented submission.
• noun In Scots law, the form by which a vassal returns the feu into the hands of a superior.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of resigning or giving up, as a claim, possession, office, or the like; surrender.
• noun The state of being resigned or submissive; quiet or patient submission; unresisting acquiescence.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun the act of resigning
• noun a written or oral declaration that one resigns
• noun state of uncomplaining, utter frustration

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun acceptance of despair
• noun a formal document giving notice of your intention to resign
• noun the act of giving up (a claim or office or possession etc.)