This is the 802nd most frequent Norwegian word.
offisielt
Official.
The word 'offisielt' (officially) is used as an adverb here, indicating that the action is performed in an official capacity or manner.
Den norske regjeringen har offisielt vedtatt den nye loven.
The Norwegian government has officially passed the new law.
Here, 'offisielt' (officially) is used as an adverb to denote the formal or scheduled start of the event.
Arrangementet starter offisielt klokka 10.
The event officially begins at 10 o'clock.
The word 'offisielle' (official) is an adjective in this context, modifying 'sertifikasjonen' to specify that it is recognized or sanctioned formally.