In a congregational manner; in the way that a congregation operates; according to congregational principles of group decision-making and local independence.
From 'congregational' plus the suffix '-ly' (in a manner of), used to describe how something happens or functions like a congregation.
This adverb describes the way something is done—like if decisions are made congregationally, it means the whole group discusses and decides together rather than having a leader decide for everyone.
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