What is another word for quaternity?
Pronunciation: [kwˈatənɪti] (IPA) 
Quaternity is a rare word that refers to a group or set of four things. However, there are a few synonyms that can be used interchangeably when referring to sets of four. The terms quartet, tetrad, and quadruplet are commonly used to refer to four people, things, or ideas. These words can also be used for musical groups of four performers or four-note musical chords. The word foursome is also a synonym, but it's often used in a more casual sense to refer to a group of four people playing a game together. Other related words include quadruple, meaning four times as much, and quaternary, which refers to anything that comes in sets of four.
