Used to say that you think something is probably true, even though you are not completely sure. It signals that you are making a reasonable guess.
From *presume* plus the adverbial suffix *-ably*, literally meaning 'in a way that can be presumed'. It shares roots with Latin *praesumere*, 'to take beforehand'.
Whenever you say 'presumably', you’re politely admitting you’re guessing. The word is a social cushion—it lets you sound confident while still leaving an exit if you’re wrong. It’s logic plus humility, packed into one adverb.
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