Processional /(?)/

Pro·ces·sion·al

Processional

a.
  1. Of or pertaining to a procession; consisting in a procession.
    The processional services became more frequent.

Processional

n.
  1. A service book relating to ecclesiastical processions. (R. C. Ch.)
  2. A hymn, or other selection, sung during a church procession; as, the processional was the 202d hymn.