treble

1. The highest singing voice (especially as for a boy) or part in musical composition.
2. A person or instrument having a treble voice or pitch; a boy soprano.
3. The highest tuned in a ring of bells.
4. Any high-pitched or shrill voice or sound.
5. A threefold quantity or number; something having three parts or having been tripled.
6. A drink with three portions of alcohol.
7. Any of the narrow areas enclosed by the two central circles on a dartboard, worth three times the usual value of the segment.
8. Three goals, victories, awards etc. in a given match or season.

1. To multiply by three; to make into three parts, layers, or thrice the amount.
2. To become multiplied by three or increased threefold.
3. To make a shrill or high-pitched noise.
4. To utter in a treble key; to whine.

1. Pertaining to the highest singing voice or part in harmonized music; soprano.
2. High in pitch; shrill.
3. Threefold, triple.

adverb

Trebly; triply.