Source : Webster's Revised Unabridged Dictionary (1913)

Gan \Gan\, imp. of {Gin}. [See {Gin}, v.]
   Began; commenced.

Gin \Gin\, v. i. [imp. & p. p. {Gan}, {Gon} (?), or {Gun} (?);
   p. pr. & vb. n. {Ginning}.] [OE. ginnen, AS. ginnan (in
   comp.), prob. orig., to open, cut open, cf. OHG. inginnan to
   begin, open, cut open, and prob. akin to AS. g[=i]nan to
   yawn, and E. yawn. ? See {Yawn}, v. i., and cf. {Begin}.]
   To begin; -- often followed by an infinitive without to; as,
   gan tell. See {Gan}. [Obs. or Archaic] ``He gan to pray.''
   --Chaucer.

Source : WordNet®

gan
     See {gin}
     [also: {ganning}, {ganned}]

gin
     n 1: strong liquor flavored with juniper berries
     2: a trap for birds or small mammals; often has a noose [syn: {snare},
         {noose}]
     3: a machine that separates the seeds from raw cotton fibers
        [syn: {cotton gin}]
     4: a form of rummy in which a player can go out if the cards
        remaining in their hand total less than 10 points [syn: {gin
        rummy}, {knock rummy}]
     [also: {ginning}, {ginned}, {gan}]

gin
     v 1: separate the seeds from (cotton) with a cotton gin
     2: trap with a snare; "gin game"
     [also: {ginning}, {ginned}, {gan}]

Source : Free On-Line Dictionary of Computing

GAN
     
        Generating and Analyzing Networks.  "GAN - A System for
        Generating and Analyzing Activity Networks", A. Schurmann,
        CACM 11(10) (Oct 1968).