The Collaborative International Dictionary of English v.0.48:

Gig \Gig\, n.
   A kind of spear or harpoon. See Fishgig.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gig \Gig\, v. t.
   To fish with a gig.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gig \Gig\, n. [OE. gigge. Cf. Giglot.]
   A playful or wanton girl; a giglot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gig \Gig\, n. [Cf. Icel. g[imac]gja fiddle, MHG. g[imac]ge, G.
   geige, Icel. geiga to take a wrong direction, rove at random,
   and E. jig.]
   1. A top or whirligig; any little thing that is whirled round
      in play.
      [1913 Webster]

            Thou disputest like an infant; go, whip thy gig.
                                                  --Shak.
      [1913 Webster]

   2. A light carriage, with one pair of wheels, drawn by one
      horse; a kind of chaise.
      [1913 Webster]

   3. (Naut.) A long, light rowboat, generally clinkerbuilt, and
      designed to be fast; a boat appropriated to the use of the
      commanding officer; as, the captain's gig.
      [1913 Webster]

   4. (Mach.) A rotatory cylinder, covered with wire teeth or
      teasels, for teaseling woolen cloth.
      [1913 Webster]

   Gig machine, Gigging machine, Gig mill, or Napping
   machine. See Gig, 4.

   Gig saw. See Jig saw.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gig \Gig\, n.
   A job for a specified, usually short period of time; -- used
   especially for the temporary engagements of an entertainer,
   such as a jazz musician or a rock group; as, a one-week gig
   in Las Vegas.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

Gig \Gig\ (j[i^]g or g[i^]g), n. [Cf. OF. gigue. See Jig, n.]
   A fiddle. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gig \Gig\ (g[i^]g), v. t. [Prob. fr. L. gignere to beget.]
   To engender. [Obs.] --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gig
    n 1: long and light rowing boat; especially for racing
    2: an implement with a shaft and barbed point used for catching
       fish [syn: spear, gig, fizgig, fishgig, lance]
    3: a cluster of hooks (without barbs) that is drawn through a
       school of fish to hook their bodies; used when fish are not
       biting
    4: tender that is a light ship's boat; often for personal use of
       captain
    5: small two-wheeled horse-drawn carriage; with two seats and no
       hood
    6: a booking for musicians; "they played a gig in New Jersey"

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "gig":
   angle, appointment, bait the hook, berth, billet, bob, clam, dap,
   dib, dibble, drive, employment, engagement, fish, fly-fish,
   go fishing, grig, guddle, incumbency, jack, jacklight, jig, job,
   moonlighting, net, office, opening, place, position, post,
   second job, seine, service, shrimp, situation, spin, station,
   still-fish, tenure, torch, trawl, troll, vacancy, whale



The Jargon File (version 4.4.7, 29 Dec 2003):

gig
 /jig/, /gig/, n.

    [SI] See quantifiers.


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

gigabyte
gig

    (GB or colloquially "gig") A unit of data equal to
   one billion bytes but see binary prefix for other definitions.
   A gigabyte is 1000^3 bytes or 1000 megabytes.

   A human gene sequence (including all the redundant codons)
   contains about 1.5 gigabytes of data.

   1000 gigabytes are one terabyte.

   See prefix.

   Human genome data content

(http://bitesizebio.com/articles/how-much-information-is-stored-in-the-human-genome/).

   (2013-11-03)