treble

having or denoting a high range

• “soprano voice”
• “soprano sax”
• “the boy still had a fine treble voice”
• “the treble clef”

three times as great or many

• “a claim for treble (or triple) damages”
• “a threefold increase”

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”

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

the pitch range of the highest female voice

sing treble

increase threefold

• “Triple your income!”