This is the 753rd most frequent Polish word.
dodatkowo
Additionally.
In this sentence, 'dodatkowo' again serves as an adverb to add an extra point to the statement.
Ona pracuje na pełny etat, a dodatkowo udziela lekcji wieczorami.
She works full-time, and additionally, she gives lessons in the evenings.
Here, 'dodatkowo' emphasizes the extra benefit as a further element of the discussion.
Dostał zniżkę, a dodatkowo zapewniono mu bezpłatną dostawę.
He received a discount, and additionally, he was provided with free shipping.
Here, 'dodatkowo' is used as an adverb meaning 'additionally' to introduce supplementary information.