In the manner of a fellow; befitting companions or peers; with the friendly and equal spirit of fellowship.
From 'fellow' with the adverbial/adjectival suffix '-ly,' creating a descriptive word that emphasizes fellowship qualities. This archaic form emphasizes the spirit of equality and camaraderie.
Medieval writing is full of 'fellowly conduct' and 'fellowly behavior'—it was how people described what we'd now call 'teamwork' or 'camaraderie,' emphasizing that everyone was treating everyone else as equals!
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