Relating to or belonging to a council or assembly, especially a church council.
From Late Latin conciliaris, derived from concilium (council). The suffix -ar denotes relationship or belonging, making this adjective describe anything connected to or characteristic of councils.
When the Catholic Church refers to 'conciliar decisions,' they're emphasizing that multiple people gathered and agreed—it's a democratic-sounding way to describe church authority, even if those councils were often dominated by powerful bishops.
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