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for sure, surely; when one is certain; surely, certainly - the meaning is not archaic, often used

the trick is that наверное expresses doubt, while наверняка implies certainty,

It's a bit...

It means 'perhaps, maybe, probably', etc. in modern Russian.

There is also this archaic meaning - which is 'certainly, for sure' - it's very often used by Dostoevsky, for example. But this is the...