Answer: synodic

AnswerCrossword Clue
SYNODICRe religious meetings
SYNODICPertaining to a church council
SYNODIC... month (moon phase recurrence)
SYNODICOf a church council
synodicpertaining to a synod (a church council)
synodicof or pertaining to a synod; synodal
synodicpertaining to a conjunction, or to two successive conjunctions of the same bodies