1A religious or mystical ceremony which is considered benign.
2(Chiefly Roman Catholic Church) a religious service or assembly of a congregation held in the absence of a priest; (also occasionally) the first mass celebrated by a newly ordained priest.
Origin
Late 19th century; earliest use found in The Nation.
Definition of white mass in US English:
white mass
noun
1A religious or mystical ceremony which is considered benign.
2(Chiefly Roman Catholic Church) a religious service or assembly of a congregation held in the absence of a priest; (also occasionally) the first mass celebrated by a newly ordained priest.
Origin
Late 19th century; earliest use found in The Nation.