Webster's English Dictionary

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treble

1. tre.ble \'treb-*l\ n [ME, perh. fr. MF, trio, fr. treble, adj.] 1a: the 
   highest of the four voice parts in vocal music : SOPRANO  1b: a singer or 
   instrument taking this part  1c: a high-pitched or shrill voice, tone, or 
   sound  1d: the upper half of the musical pitch range  1e: the higher 
   portion of the audio frequency range in sound recording and  broadcasting 
   2: something treble in construction, uses, amount, number, or value 
2. treble \'treb-(*-)le-\ aj [ME, fr. MF, fr. L triplus - more at TRIPLE] 
   1a: having three parts : THREEFOLD  1b: triple in number or amount  2a: 
   relating to or having the range of a musical treble {~ voice> 2b: 
   high-pitched : SHRILL  2c: of, relating to, or having the range of treble 
   in sound recording and  broadcasting {~ frequencies} - tre.bly av
3. treble \-(*-)lin\ vb or tre.bling : to increase threefold  1: to sing 
   treble  2: to grow to three times the size, amount, or number