This is the 5599th most frequent Dutch word.
meeussen
It appears "meeussen" is not a standard Dutch word but could be a proper name or a misspelling.
The word 'meedoen' means 'to join or participate', used here in the context of taking part in an educational activity.
Ik wil graag meedoen met de Nederlandse les.
I would like to participate in the Dutch lesson.
The word 'mee' is used here to indicate the action of bringing something along with oneself.
We mogen niet vergeten om de pen mee te nemen.
We should not forget to bring the pen along.
The word 'mee' is used here indicating the action of joining an activity involving others.