English
processioner
From procession + -er.
Formed from procession + -er
Proto-Italic *kezdō
…
Latin prōcēdō ‘to proceed, advance’
Latin prōcessiō ‘a marching forward, an advance, in Late Latin…’
Old French pourciession
Middle English processioun
English procession
Today it means
noun One who takes part in a procession.
Language periods are conventional ranges, not dates for this word.
Etymograph / processioner