It is a word of Nahuatl origin, meaning market. Site where you can buy everything. Merchandise, souk, market, fair, square, awning.
Place where people go to buy things they need like clothes, fruits, vegetables, etc.
Tianguis: m. In Mexico. Market, mainly that settles periodically on the street: "Thursday becomes a tianguis to the neighborhood where I live, in it we bought food, clothes and other things ".