In a manner that expresses or shows brotherly affection and support.
From 'fraternal' (Latin 'fraternus') plus the adverbial suffix '-ly.' Indicates an action or gesture performed in the spirit of brotherhood.
When someone acts 'fraternally' toward you, they're treating you with the genuine warmth and support you'd get from a sibling—it's a warmer, more personal way to relate than just being polite.
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