/ prəˈseʃn; NAmE / noun
1.
[ C , U ] a line of people or vehicles that move along slowly, especially as part of a ceremony; the act of moving in this way :
a funeral procession
a torchlight procession
The procession made its way down the hill.
Groups of unemployed people from all over the country marched in procession to the capital.
2.
[ C ] a number of people who come one after the other :
A procession of waiters appeared bearing trays of food.
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WORD ORIGIN
late Old English , via Old French from Latin processio(n-) , from procedere move forward, from pro- forward + cedere go.