In a way that has been confirmed; admittedly or certainly, based on confirmation or proof.
From 'confirmed' (past participle of 'confirm' used as an adjective) plus the adverb suffix '-ly.' The word emphasizes that something has undergone confirmation and can now be stated with certainty.
Words like 'confirmedly' are quite rare because English typically prefers to say 'it is confirmed that' rather than making adverbs from past participles—showing that word frequency depends on how efficiently we can express ideas using existing, common structures.
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