means a torchlight procession (from the Latin, funis, a torch), because funerals among the Romans took place at night by torchlight, that magistrates and priests might not be violated by seeing a corpse, and so be prevented from performing their sacred duties.
“Funus [a funeral], from funes or funalia [torches] … . . originally made of ropes.”—Adams: Roman Antiquities (Funerals).