Relating to a consistory, especially an ecclesiastical court or council in the Catholic Church; having the authority or nature of a formal church assembly.
From consistory + -ial suffix. Consistory comes from Latin consistorium 'place where one stands,' the council chamber where cardinals meet.
When the Pope convenes cardinals for important decisions, that's a 'consistorial assembly'—the word literally refers to the standing place where church leaders formally gather!
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