Source : Webster's Revised Unabridged Dictionary (1913)

Triple \Tri"ple\, v. i. [imp. & p. p. {Tripled}; p. pr. & vb. n.
   {Tripling}.] [Cf. F. tripler. See {Triple}, a.]
   To make threefold, or thrice as much or as many; to treble;
   as, to triple the tax on coffee.

Triple \Tri"ple\, a. [L. triplus; tri- (see {Tri-}) + -plus, as
   in duplus double: cf. F. triple. See {Double}, and cf.
   {Treble}.]
   1. Consisting of three united; multiplied by three;
      threefold; as, a triple knot; a triple tie.

            By thy triple shape as thou art seen. --Dryden.

   2. Three times repeated; treble. See {Treble}.

   3. One of three; third. [Obs.] --Shak.

   {Triple crown}, the crown, or tiara, of the pope. See
      {Tiara}, 2.

Source : WordNet®

triple
     adj 1: having three units or components or elements; "a ternary
            operation"; "a treble row of red beads"; "overcrowding
            made triple sessions necessary"; "triple time has
            three beats per measure"; "triplex windows" [syn: {ternary},
             {treble}, {triplex}]
     2: three times as great or many; "a claim for treble (or
        triple) damages"; "a threefold increase" [syn: {treble}, {threefold}]

triple
     v 1: increase threefold; "Triple your income!" [syn: {treble}]
     2: hit a three-base hit

triple
     n 1: a base hit at which the batter stops safely at third base
          [syn: {three-base hit}, {three-bagger}]
     2: a quantity that is three times as great as another