verification

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

• noun The act of verifying or the state of being verified.
• noun A sworn statement attesting to the truth of the facts in a document.
• noun A sworn statement attesting that a pleading is true to the best of one's knowledge.

from The Century Dictionary.

• noun The act or process of verbifying. Trans. Amer. Philol. Ass., XV. 32, A pp.
• noun The act of verifying, or proving to be true; the act of confirming or establishing the authenticity of any powers granted, or of any transaction, by legal or competent evidence; the state of being verified; authentication; confirmation.
• noun In law: A short affidavit appended to a pleading or petition to the effect that the statements in it are true.
• noun At common law, the formal statement at the end of a plea, “and this he is ready to verify.”

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

• noun The act of verifying, or the state of being verified; confirmation; authentication.
• noun Confirmation by evidence.
• noun A formal phrase used in concluding a plea.
• noun (Math.) the operation of testing the equation of a problem, to see whether it expresses truly the conditions of the problem.

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

• noun The act of verifying.
• noun The state of being verified.
• noun Confirmation; authentication.
• noun law A formal phrase used in concluding a plea, to denote confirmation by evidence.
• noun mathematics The operation of testing the equation of a problem, to see whether it truly expresses the conditions of the problem.

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

• noun additional proof that something that was believed (some fact or hypothesis or theory) is correct
• noun (law) an affidavit attached to a statement confirming the truth of that statement