treble in WordNet English dictionary

1. 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
   double  dual  twofold  two-fold  treble  threefold  three-fold 
   
2. having or denoting a high range
   "soprano voice"; "soprano sax"; "the boy still had a fine treble voice"; "the treble clef"
   soprano  treble 
   
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"
   ternary  treble  triple  triplex 
   
4. three times as great or many
   "a claim for treble (or triple) damages"; "a threefold increase"
   treble  threefold  three-fold  triple 
   

1. the pitch range of the highest female voice
   soprano  treble 
   

1. increase threefold
   "Triple your income!"
   triple  treble 
   
2. sing treble
   treble