procession
n. countablen. a line of people or vehicles moving forward slowly as part of a ceremony or public event. You often see this at weddings, funerals, or parades.
n. a number of people or vehicles moving forward in an orderly, formal, or ceremonial manner. Often associated with religious, civic, or funerary rites.
The wedding procession moved slowly toward the church.
A long funeral procession followed the hearse through the quiet streets of the village.
The annual carnival procession featured elaborate floats and dancers, drawing thousands of spectators who lined the city's main boulevard.
From Middle English processioun, borrowed from Old French pourciession, from Latin prōcessiō (“a marching forward, an advance, in Late Latin a religious procession”), from prōcēdere, past participle prōcessus (“to move forward, advance, proceed”); see proceed.
Commonly used with 'of' to describe the participants, such as a 'procession of mourners' or a 'procession of cars'.