The Collaborative International Dictionary of English v.0.48:

Rig \Rig\, n.
   1. (Naut.) The peculiar fitting in shape, number, and
      arrangement of sails and masts, by which different types
      of vessels are distinguished; as, schooner rig, ship rig,
      etc. See Illustration in Appendix.
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   2. Dress; esp., odd or fanciful clothing. [Colloq.]
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The Collaborative International Dictionary of English v.0.48:

Rig \Rig\, n. [Cf. Wriggle.]
   1. A romp; a wanton; one given to unbecoming conduct. [Obs.]
      --Fuller.
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   2. A sportive or unbecoming trick; a frolic.
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   3. A blast of wind. [Prov. Eng.] --Wright.
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            That uncertain season before the rigs of Michaelmas
            were yet well composed.               --Burke.
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   To run a rig, to play a trick; to engage in a frolic; to do
      something strange and unbecoming.
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            He little dreamt when he set out
            Of running such a rig.                --Cowper.
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The Collaborative International Dictionary of English v.0.48:

Rig \Rig\, v. i.
   To play the wanton; to act in an unbecoming manner; to play
   tricks. "Rigging and rifling all ways." --Chapman.
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The Collaborative International Dictionary of English v.0.48:

Rig \Rig\, v. t.
   To make free with; hence, to steal; to pilfer. [Obs. or
   Prov.] --Tusser.
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   To rig the market (Stock Exchange), to raise or lower
      market prices, as by some fraud or trick. [Cant]
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The Collaborative International Dictionary of English v.0.48:

Rig \Rig\, n. [See Ridge.]
   A ridge. [Prov. or Scott.]
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The Collaborative International Dictionary of English v.0.48:

Rig \Rig\, v. t. [imp. & p. p. Rigged; p. pr. & vb. n.
   Rigging.] [Norweg. rigga to bind, particularly, to wrap
   round, rig; cf. AS. wr[imac]han to cover.]
   1. To furnish with apparatus or gear; to fit with tackling.
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   2. To dress; to equip; to clothe, especially in an odd or
      fanciful manner; -- commonly followed by out.
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            Jack was rigged out in his gold and silver lace.
                                                  --L'Estrange.
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   To rig a purchase, to adapt apparatus so as to get a
      purchase for moving a weight, as with a lever, tackle,
      capstan, etc.

   To rig a ship (Naut.), to fit the shrouds, stays, braces,
      etc., to their respective masts and yards.
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WordNet (r) 3.0 (2006):

rig
    n 1: gear (including necessary machinery) for a particular
         enterprise
    2: a truck consisting of a tractor and trailer together [syn:
       trailer truck, tractor trailer, trucking rig, rig,
       articulated lorry, semi]
    3: formation of masts, spars, sails, etc., on a vessel [syn:
       rig, rigging]
    4: a set of clothing (with accessories); "his getup was
       exceedingly elegant" [syn: outfit, getup, rig,
       turnout]
    5: gear used in fishing [syn: fishing gear, tackle, fishing
       tackle, fishing rig, rig]
    6: a vehicle with wheels drawn by one or more horses [syn:
       carriage, equipage, rig]
    7: the act of swindling by some fraudulent scheme; "that book is
       a fraud" [syn: swindle, cheat, rig]
    v 1: arrange the outcome of by means of deceit; "rig an
         election" [syn: rig, set up]
    2: manipulate in a fraudulent manner; "rig prices" [syn: rig,
       manipulate]
    3: connect or secure to; "They rigged the bomb to the ignition"
    4: equip with sails or masts; "rig a ship" [syn: rig, set,
       set up]