trad /træd/ (also trad jazz) noun [uncountableU] a style of jazz that was popular in the 1920s. One instrument plays complicated rhythms and notes, and the rest of the instruments play regular rhythms. 传统爵士乐〔20世纪20年代流行的一种爵士乐风格,由一件乐器奏出复杂的节奏和音符,其余乐器演奏固定节奏〕