In a manner that is assumed or supposed to be true; based on what is believed or taken for granted rather than proven.
From 'assumed' (past participle of assume) plus '-ly.' While 'assumably' emphasizes capability of assumption, 'assumedly' emphasizes that something is actually being treated as assumed in the current context. Both forms evolved in English but 'assumedly' is more common.
There's a subtle power in 'assumedly'—it lets speakers acknowledge that they're working from assumptions without quite admitting those assumptions might be wrong. Politicians and lawyers use it strategically: 'Assumedly, everyone supports good schools' sounds collaborative while actually sneaking in an unproven claim!
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