amendment

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

• noun The act of changing for the better; improvement.
• noun A correction or alteration, as in a manuscript.
• noun The process of formally altering or adding to a document or record.
• noun A statement of such an alteration or addition.
• noun One of the provisions in the US Constitution protecting individual rights.
• noun A material, such as organic matter or sand, mixed into soil to improve growing conditions.

from The Century Dictionary.

• noun The act of freeing from faults; the act of making better, or of changing for the better; correction; improvement; reformation: as, “amendment of life,”
• noun The act of becoming better, or the state of having become better; specifically, recovery of health.
• noun In deliberative assemblies, an alteration proposed to be made in the draft of a bill, or in the terms of a motion under discussion.
• noun An alteration of a legislative or deliberative act or in a constitution; a change made in a law, either by way of correction or addition.
• noun In law, the correction of an error in a writ, record, or other judicial document.
• noun Compensation; reparation. Chaucer, Reeve's Tale.

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

• noun An alteration or change for the better; correction of a fault or of faults; reformation of life by quitting vices.
• noun In public bodies; Any alternation made or proposed to be made in a bill or motion by adding, changing, substituting, or omitting.
• noun (Law) Correction of an error in a writ or process.

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

• noun An alteration or change for the better; correction of a fault or of faults; reformation of life by quitting vices.
• noun In public bodies; Any alteration made or proposed to be made in a bill or motion that adds, changes, substitutes, or omits.
• noun law Correction of an error in a writ or process.
• noun An addition to and/or alteration to the Constitution.
• noun That which is added; that which is used to increase or supplement something.

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

• noun the act of amending or correcting
• noun a statement that is added to or revises or improves a proposal or document (a bill or constitution etc.)