1. : a small, strolling, Mexican band consisting usually of trumpeters, guitarists, and violinists. also : a musician belonging to such a band. often used before another noun.

Mariachi is a traditional Mexican music and a fundamental element of Mexican culture. Traditional Mariachi groups, made up of two or more members, wear regional costumes adapted from the charro costume and interpret a broad repertoire of songs on stringed instruments.

Historians place the origin of mariachi music in the western part of Mexico, likely in an area encompassing the states of Jalisco, Nayarit, Zacatecas, Aguascalientes, Guanajuato, Michoacán, and Colima.

The mariachi orchestra emerged in the late 1700s or early 1800s in west-central Mexico. The word mariachi may have come from the now-extinct language of the Coca Indians, but both the word's etymology and the early history of the form and its followers are unknown.