Source : Webster's Revised Unabridged Dictionary (1913)

Bank bill \Bank" bill`\
   1. In America (and formerly in England), a promissory note of
      a bank payable to the bearer on demand, and used as
      currency; a bank note.

   2. In England, a note, or a bill of exchange, of a bank,
      payable to order, and usually at some future specified
      time. Such bills are negotiable, but form, in the strict
      sense of the term, no part of the currency.

Source : WordNet®

bank bill
     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}, {banker's bill},
          {bank note}, {banknote}, {Federal Reserve note}, {greenback}]