1 a number of people or vehicles etc. moving forward in orderly succession, esp. at a ceremony, demonstration, or festivity.
2 the movement of such a group (go in procession).
3 a race in which no competitor is able to overtake another.
4 Theol. the emanation of the Holy Spirit.
Derivatives:
processionist n.
Etymology: ME f. OF f. L processio -onis (as PROCEED)
Useful english dictionary. 2012.