"book of hymns for use in processions," mid-15c., from Medieval Latin processionale, from noun use of neuter of processionalis "pertaining to a procession," from Late Latin processio (see procession).
processional (adj.)
"pertaining to a procession or processions," 1610s, from procession (n.) + -al (1).
processional music
processional cross
in good processional order
proceedings
proceeds
procerity
process
procession
processional
processor
pro-choice
proclaim
proclamation
proclitic