triplet
/ˈtrɪplɪt; `trɪplɪt/ n
1 (usu pl 通常作复数) any of three children or animals born at one time 三胞胎中的一个
His wife gave birth to triplets. 他妻子生了三胞胎.2 set of three things 三个的一组; 三件之一套.
3 (music音) group of three equal notes to be performed in the time usually taken to perform two of the same kind 三连音符.