mariachi /ˌmɑɹ.iˈɑ.t͡ʃi/noun 3adjective 2forms 1 noun3 •A traditional form of Mexican music, either sung or purely instrumental. •A group that plays mariachi music.At her first performance with an all-male mariachi, the oldest member said to the musical director,[…](No! I've never played with a woman; I'm not going to start now [my translation]). — 2002 •A member of such a group.The mariachis would serenade / and they would not shut up till they were paid. — 1959 adjective2 •Of or pertaining to a traditional form of Mexican music, either sung or purely instrumental. •Of or pertaining to a band playing such music, or to the singers of such songs. formsmariachis