The Collaborative International Dictionary of English v.0.48:

Shilling \Shil"ling\, n. [OE. shilling, schilling, AS. scilling;
   akin to D. schelling, OS. & OHG. scilling, G. schilling, Sw.
   & Dan. skilling, Icel. skillingr, Goth. skilliggs, and perh.
   to OHG. scellan to sound, G. schallen.]
   1. A silver coin, and money of account, of Great Britain and
      its dependencies, equal to twelve pence, or the twentieth
      part of a pound, equivalent to about twenty-four cents of
      the United States currency.
      [1913 Webster]

   2. In the United States, a denomination of money, differing
      in value in different States. It is not now legally
      recognized.
      [1913 Webster]

   Note: Many of the States while colonies had issued bills of
         credit which had depreciated in different degrees in
         the different colonies. Thus, in New England currency
         (used also in Virginia, Kentucky, Tennessee, Indiana,
         Illinois, Missouri, Mississippi, Alabama, and Florida),
         after the adoption of the decimal system, the pound in
         paper money was worth only $3.333, and the shilling
         162/3 cts., or 6s. to $1; in New York currency (also in
         North Carolina, Ohio, and Michigan), the pound was
         worth $2.50, and the shilling 121/2 cts., or 8s. to $1;
         in Pennsylvania currency (also in New Jersey, Delaware,
         and Maryland), the pound was worth $2.70, and the
         shilling 131/2 cts., or 7s. 6d. to $1; and in Georgia
         currency (also in South Carolina), the pound was worth
         $4.20[frac67], and the shilling 21[frac37] cts., or 4s
         8d. to $1. In many parts of the country . . . the
         reckoning by shillings and pence is not yet entirely
         abandoned. --Am. Cyc. (1890)
         [1913 Webster]

   3. The Spanish real, of the value of one eight of a dollar,
      or 12? cets; -- formerly so called in New York and some
      other States. See Note under 2.
      [1913 Webster]

   York shilling. Same as Shilling, 3.
      [1913 Webster] Shill-I-shall-I

WordNet (r) 3.0 (2006):

shilling
    n 1: the basic unit of money in Uganda; equal to 100 cents [syn:
         Ugandan shilling, shilling]
    2: the basic unit of money in Tanzania; equal to 100 cents [syn:
       Tanzanian shilling, shilling]
    3: the basic unit of money in Somalia; equal to 100 cents [syn:
       Somalian shilling, shilling]
    4: the basic unit of money in Kenya; equal to 100 cents [syn:
       Kenyan shilling, shilling]
    5: a former monetary unit in Great Britain [syn: British
       shilling, shilling, bob]
    6: an English coin worth one twentieth of a pound

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "shilling":
   Deutschmark, Mark, Reichsmark, afghani, anna, baht, bawbee, cent,
   centavo, centime, conto, crown, dollar, dong, farthing, fiver,
   florin, fourpence, fourpenny, franc, groat, guilder, guinea,
   gulden, halfpenny, kip, kopeck, krona, krone, lira, mag, meg,
   milreis, mite, monkey, new pence, np, p, pence, penny, peseta, pie,
   piece of eight, pistareen, pony, pound, quid, rand, rial, ruble,
   rupee, shekel, sixpence, sol, sou, stiver, tenner, threepence,
   threepenny bit, thrippence, tuppence, twopence, won, yen



Bouvier's Law Dictionary, Revised 6th Ed (1856):

SHILLING, Eng. law. The name of an English coin, of the value of one
twentieth part of a pound. In the United States, while they were colonies,
there were coins of this denomination, but they greatly varied in their
value.