In a manner that is pleasant, agreeable, and suited to one's nature; in a friendly and compatible way.
From 'congenial' (naturally suited) plus the adverb suffix '-ly.' A straightforward adverbial form with meaning connected to natural compatibility.
When people gather 'congenially,' they're not forcing it—there's genuine ease in the interaction. It's the difference between a forced group project and friends naturally enjoying time together.
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