(especially in Mexico and the southwestern U.S.) a Christmas lantern consisting of a lighted candle set in sand inside a paper bag.
Origin
1945-50; < Mexican Spanish,Spanish: any lamp or lantern displayed during a festival < Medieval Latin,Late Latinlūmināria, orig. neuter plural of lūmināris lamp; see lumen, -ar1
Examples from the web for luminaria
Several library staff volunteered during the grand opening weekend, which included a luminaria procession and mariachi music.
Also a luminaria ceremony was held in honor of survivors and those who died from the disease.