means A group of people moving forward in an orderly, often ceremonial line, as in a parade, funeral, or religious march.

from From Latin processio, 'a marching forward,' built from procedere — pro- ('forward') plus cedere ('to go,' the same root that walks through proceed, recede, and succeed). It entered English through Old French procession, carried in on the backs of churchgoers, since the word long described the solemn ceremonial walks of religious ritual before it ever joined a parade.