Source : Webster's Revised Unabridged Dictionary (1913)

Treble \Tre"ble\, v. i.
   To become threefold. --Swift.

Treble \Tre"ble\, a. [OE. treble threefold, OF. treble, treible,
   L. triplus. See {Triple}.]
   1. Threefold; triple.

            A lofty tower, and strong on every side With treble
            walls.                                --Dryden.

   2. (Mus.)
      (a) Acute; sharp; as, a treble sound. --Bacon.
      (b) Playing or singing the highest part or most acute
          sounds; playing or singing the treble; as, a treble
          violin or voice.

Treble \Tre"ble\, adv.
   Trebly; triply. [Obs.] --J. Fletcher.

Treble \Tre"ble\, n. [`` It has been said to be a corruption of
   triplum [Lat.], a third part, superadded to the altus and
   bassus (high and low).'' --Grove.] (Mus.)
   The highest of the four principal parts in music; the part
   usually sung by boys or women; soprano.

   Note: This is sometimes called the first treble, to
         distinguish it from the second treble, or alto, which
         is sung by lower female voices.

Treble \Tre"ble\, v. t. [imp. & p. p. {Trebled}; p. pr. & vb. n.
   {Trebling}.]
   1. To make thrice as much; to make threefold. ``Love trebled
      life.'' --Tennyson.

   2. To utter in a treble key; to whine. [Obs.]

            He outrageously (When I accused him) trebled his
            reply.                                --Chapman.

Source : WordNet®

treble
     n : the pitch range of the highest female voice [syn: {soprano}]

treble
     v 1: sing treble
     2: increase threefold; "Triple your income!" [syn: {triple}]

treble
     adj 1: having or denoting a high range; "soprano voice"; "soprano
            sax"; "the boy still had a fine treble voice"; "the
            treble clef" [syn: {soprano}]
     2: three times as great or many; "a claim for treble (or
        triple) damages"; "a threefold increase" [syn: {threefold},
         {triple}]
     3: 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}, {triple},
         {triplex}]
     4: having more than one decidedly dissimilar aspects or
        qualities; "a double (or dual) role for an actor"; "the
        office of a clergyman is twofold; public preaching and
        private influence"- R.W.Emerson; "every episode has its
        double and treble meaning"-Frederick Harrison [syn: {double},
         {dual}, {twofold}, {threefold}]