In a manner that is granted, admitted, or conceded; used to introduce something acknowledged as true.
From 'granted' (past participle of 'grant,' meaning admitted or conceded) + '-ly' (adverb suffix). This is a formal or archaic variant of the more common phrase 'granted' used as an interjection.
'Grantedly' is basically the Victorian-era way of saying 'sure, okay, fine'—it sounds stiff now, but it was a polite, measured way to concede a point while maintaining dignity in formal speech or writing.
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