n.[C]

1. 四重奏（曲）；四重唱（曲）
   The concert began with a Mozart quartet.

   音乐会以莫扎特的一首四重奏曲开始。

2. 四重奏乐团；四重唱演出组
3. 四人一组；四件一套

n.

1. a group of four people playing music or singing together.
   ▸a composition for a quartet.
2. a set of four people or things.