Usage Note
Certainement is slightly more emphatic than sûrement and implies strong confidence. In polite spoken French it is also used as an affirmative response equivalent to 'of course' or 'absolutely'. The related adjective certain can mean sure (predicative) or a certain/particular (attributive, placed before the noun).
Examples
"Il viendra certainement à la réunion demain."
Natural Translation
He will certainly come to the meeting tomorrow.

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