Source : Webster's Revised Unabridged Dictionary (1913)

Bank note \Bank" note`\
   1. A promissory note issued by a bank or banking company,
      payable to bearer on demand.

   Note: In the United States popularly called a bank bill.

   2. 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. [Obs.]

   3. A promissory note payable at a bank.

Source : WordNet®

bank note
     n : a piece of paper money (especially one issued by a central
         bank); "he peeled off five one-thousand-zloty notes"
         [syn: {bill}, {note}, {government note}, {bank bill}, {banker's
         bill}, {banknote}, {Federal Reserve note}, {greenback}]