reclamation

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

• noun The act or process of reclaiming.
• noun A restoration, as to productivity, usefulness, or morality.

from The Century Dictionary.

• noun A reclaiming of something as a possession; a claim or demand for return or restoration; a requirement of compensation for something wrongly taken or withheld; also, a claim to a discovery as having been previously made.
• noun A calling or bringing back, as from aberration or wrong-doing; restoration; reformation.
• noun The act of subduing to fitness for service or use; taming; amelioration: as, the reclamation of wild animals or waste land.
• noun A remonstrance; representation made in opposition; a cry of opposition or disapprobation.

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

• noun The act or process of reclaiming.
• noun Representation made in opposition; remonstrance.

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

• noun The act of reclaiming or the state of being reclaimed.
• noun The recovery of a wasteland, or of flooded land so it can be cultivated.

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

• noun rescuing from error and returning to a rightful course
• noun the conversion of wasteland into land suitable for use of habitation or cultivation
• noun the recovery of useful substances from waste products