The Collaborative International Dictionary of English v.0.48:

dollar \dol"lar\, n. [D. daalder, LG. dahler, G. thaler, an
   abbreviation of Joachimsthaler, i. e., a piece of money first
   coined, about the year 1518, in the valley (G. thal) of St.
   Joachim, in Bohemia. See Dale.]
   1.
      (a) A silver coin of the United States containing 371.25
          grains of silver and 41.25 grains of alloy, that is,
          having a total weight of 412.5 grains.
      (b) A gold coin of the United States containing 23.22
          grains of gold and 2.58 grains of alloy, that is,
          having a total weight of 25.8 grains, nine-tenths
          fine. It is no longer coined.
          [1913 Webster]

   Note: Previous to 1837 the silver dollar had a larger amount
         of alloy, but only the same amount of silver as now,
         the total weight being 416 grains. The gold dollar as a
         distinct coin was first made in 1849. The eagles, half
         eagles, and quarter eagles coined before 1834 contained
         24.75 grains of gold and 2.25 grains of alloy for each
         dollar.
         [1913 Webster]

   2. A coin of the same general weight and value as the United
      States silver dollar, though differing slightly in
      different countries, formerly current in Mexico, Canada,
      parts of South America, also in Spain, and several other
      European countries.
      [1913 Webster +PJC]

   3. The value of a dollar; the unit of currency, differing in
      value in different countries, commonly employed in the
      United States and a number of other countries, including
      Australia, Canada, Hong Kong, parts of the Carribbean,
      Liberia, and several others.
      [1913 Webster +PJC]

   Chop dollar. See under 9th Chop.

   Dollar fish (Zool.), a fish of the United States coast
      (Stromateus triacanthus), having a flat, roundish form
      and a bright silvery luster; -- called also butterfish,
      and Lafayette. See Butterfish.

   Trade dollar, a silver coin formerly made at the United
      States mint, intended for export, and not legal tender at
      home. It contained 378 grains of silver and 42 grains of
      alloy.

WordNet (r) 3.0 (2006):

dollar
    n 1: the basic monetary unit in many countries; equal to 100
         cents
    2: a piece of paper money worth one dollar [syn: dollar,
       dollar bill, one dollar bill, buck, clam]
    3: a United States coin worth one dollar; "the dollar coin has
       never been popular in the United States"
    4: a symbol of commercialism or greed; "he worships the almighty
       dollar"; "the dollar sign means little to him" [syn:
       dollar, dollar mark, dollar sign]

Moby Thesaurus II by Grady Ward, 1.0:

113 Moby Thesaurus words for "dollar":
   C, C-note, Deutschmark, G, G-note, Mark, Reichsmark, afghani, anna,
   baht, bawbee, bill, bone, buck, cartwheel, cent, centavo, centime,
   century, conto, copper, crown, dime, dollar bill, dong, farthing,
   fifty cents, fin, fish, five cents, five hundred dollars,
   five-dollar bill, five-hundred-dollar bill, five-spot, fiver,
   florin, four bits, fourpence, fourpenny, franc, frogskin, grand,
   groat, guilder, guinea, gulden, half G, half a C, half crown,
   half dollar, half grand, halfpenny, hundred-dollar bill, iron man,
   kip, kopeck, krona, krone, lira, mag, meg, mill, milreis, mite,
   monkey, new pence, nickel, np, p, pence, penny, peseta, pie,
   piece of eight, pistareen, pony, pound, quarter, quid, rand,
   red cent, rial, rock, ruble, rupee, sawbuck, shekel, shilling,
   silver dollar, sixpence, skin, smacker, sol, sou, stiver,
   ten cents, ten-spot, tenner, thousand dollars,
   thousand-dollar bill, threepence, threepenny bit, thrippence,
   tuppence, twenty-dollar bill, twenty-five cents, two bits,
   two-dollar bill, two-spot, twopence, won, yard, yen



The Free On-line Dictionary of Computing (30 December 2018):

dollar
$
$

    "$", numeric character reference: "$", Common
   names: ITU-T: dollar sign.  Rare: currency symbol; buck; cash;
   string; escape (when used as the echo of ASCII ESC); ding;
   cache; INTERCAL: big money.

   Well-known uses of the dollar symbol in computing include as a
   prefix on the names of string variables in BASIC, shell
   and related languages like Perl.  In shell languages it is also
   used in positional parameters so "$1" is the first parameter to
   a shell script, "$2" the second, etc.  In a regular expression,
   $ matches the end of the string.

   (2015-01-24)


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

DOLLAR, money. A silver coin of the United States of the value of one
hundred cents, or tenth part of an eagle.
     2. It weighs four hundred and twelve and a half grains. Of one thousand
parts, nine hundred are of pure silver and one hundred of alloy. Act of
January 18, 1837, ss. 8 & 9, 4 Sharsw. Cont. of Story's L. U. S. 2523, 4;
Wright, R. 162.
     3. In all computations at the custom-house, the specie dollar of Sweden
and Norway shall be estimated at one hundred and six cents. The specie
dollar of Denmark,  at one hundred and five cents. Act of May 22, 1846.