The Collaborative International Dictionary of English v.0.48:

Die \Die\, n.; pl. in 1 and (usually) in 2, Dice (d[imac]s);
   in 4 & 5, Dies (d[imac]z). [OE. dee, die, F. d['e], fr. L.
   datus given, thrown, p. p. of dare to give, throw. See Date
   a point of time.]
   1. A small cube, marked on its faces with spots from one to
      six, and used in playing games by being shaken in a box
      and thrown from it. See Dice.
      [1913 Webster]

   2. Any small cubical or square body.
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            Words . . . pasted upon little flat tablets or dies.
                                                  --Watts.
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   3. That which is, or might be, determined, by a throw of the
      die; hazard; chance.
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            Such is the die of war.               --Spenser.
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   4. (Arch.) That part of a pedestal included between base and
      cornice; the dado.
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   5. (Mach.)
      (a) A metal or plate (often one of a pair) so cut or
          shaped as to give a certain desired form to, or
          impress any desired device on, an object or surface,
          by pressure or by a blow; used in forging metals,
          coining, striking up sheet metal, etc.
      (b) A perforated block, commonly of hardened steel used in
          connection with a punch, for punching holes, as
          through plates, or blanks from plates, or for forming
          cups or capsules, as from sheet metal, by drawing.
      (c) A hollow internally threaded screw-cutting tool, made
          in one piece or composed of several parts, for forming
          screw threads on bolts, etc.; one of the separate
          parts which make up such a tool.
          [1913 Webster]

   Cutting die (Mech.), a thin, deep steel frame, sharpened to
      a cutting edge, for cutting out articles from leather,
      cloth, paper, etc.

   The die is cast, the hazard must be run; the step is taken,
      and it is too late to draw back; the last chance is taken.
      Diecian

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

DIES. A day. There are four sorts of days: 1. A natural day; as, the morning
and the evening made the first day. 2. An artificial day; that is, from day-
break until twilight in the evening. 3. An astrological day, dies
astrologicus, from sun to sun. 4. A legal day, which is dies juridicus, and
dies non juridicus. 1. Dies juridici, are all days given in term to the
parties in court. Dies non juridici are those which are not appointed to do
business in court, as Sundays, and the like. Dies in banco, days of
appearance in the English court of common bench. 3 Bl. Com. 276. Vide Day,
and 3 Com. Dig. 358.