banknote

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

• noun A piece of paper currency.
• noun A promissory note issued by a central bank.

from The Century Dictionary.

• noun A promissory note payable on demand, made and issued by a bank authorized by law, and intended to circulate as money. In the United States frequently called bank-bill.

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

• A promissory note issued by a bank or banking company, payable to the bearer on demand. See also sense 4.
• obsolete Formerly, a promissory note made by a banker, or banking company, payable to a specified person at a fixed date; a bank bill. See Bank bill, 2.
• A promissory note payable at a bank.
• A promissory note issued by an authorized bank, payable to the bearer on demand and intended to circulate as government-authorized money; in the United States such notes may only be issued by a Federal Reserve Bank.

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

• noun A piece of paper currency.
• noun historical A demand note issued by private banks presumably backed up by gold or silver coin.

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

• noun a piece of paper money (especially one issued by a central bank)
• noun a piece of paper money (especially one issued by a central bank)