This is the 46th most frequent Polish word.
nawet
Even.
The word 'nawet' is used here to emphasize that someone unexpected or unusual attended the meeting.
Nawet on przyszedł na spotkanie.
Even he came to the meeting.
In this case, 'nawet' intensifies the speaker's lack of knowledge, adding a sense of emphasis.
Nawet nie wiem, o co chodzi.
I don't even know what it's about.
Here, 'nawet' stresses the surprising simplicity or accessibility of the subject matter.