Definition of mariachis:
(n) :
A traditional form of Mexican music, either sung or purely instrumental.
(n) :
A group that plays mariachi music.
(n) :
A member of such a group.
(adj) :
Of or pertaining to a traditional form of Mexican music, either sung or purely instrumental.
(adj) :
Of or pertaining to a band playing such music, or to the singers of such songs.