triplet

noun7

1. •
   A set of three.
2. •
   One of a group of three.
3. •
   One of a group of three siblings born at the same time to the same mother.
4. •
   A group of three notes of even rhythm played or written where two of those notes would ordinarily be; a form of tuplet.
5. •
   A triquark.
6. •
   A quantum state with three allowed projections for the spin.
7. •
   A constructed gem consisting of a thin slice of natural opal sandwiched between a clear glass or quartz top and a synthetic or stone backing that enhances the colour of the opal.