1. [n]  a base hit at which the batter stops safely at third base
2. [n]  a quantity that is three times as great as another
3. [adj]  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"
4. [adj]  three times as great or many; "a claim for treble (or triple) damages"; "a threefold increase"
5. [v]  increase threefold; "Triple your income!"
6. [v]  hit a three-base hit, in baseball

Triple
As Egypt comes closer to developing a nuclear device, Israel hatches a plot to steal uranium and even the balance of power by quickly building its own nuke. Reissue.

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1. \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.
   {Triple-expansion steam engine}, a compound steam engine in
      which the same steam performs work in three cylinders
      successively.
   {Triple measure} (Mus.), a measure of tree beats of which
      first only is accented.
   {Triple ratio} (Math.), a ratio which is equal to 3.
   {Triple salt} (Chem.), a salt containing three distinct basic
      atoms as radicals; thus, microcosmic salt is a triple
      salt.
   {Triple star} (Astron.), a system of three stars in close
      proximity.
   {Triple time} (Mus.), that time in which each measure is
      divided into three equal parts.
   {Triple valve}, in an automatic air brake for railroad cars,
      the valve under each car, by means of which the brake is
      controlled by a change of pressure in the air pipe leading
      from the locomotive.
   

2. \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.