tri·ple /ˈtrɪpəl/
 三倍之數,三個一組(a.)三倍的(vt.)三倍與(vi.)增至三倍


 triple
 三元 三倍


 Tri·ple, v. i. [imp. & p. p. Tripled p. pr. & vb. n. Tripling ]  To make threefold, or thrice as much or as many; to treble; as, to triple the tax on coffee.

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 Tri·ple a.
 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.]
 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.


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