Translation

1. in the end, finally, eventually

   Es freut mich, Sie schließlich zu treffen.

   I'm glad to finally meet you.

   2017, Blick am Abend, Leben in Zahlen von…Jessica Chastain, 24 March

   She didn't particularly like school as a child and teenager, and she finally gave up high school at 17.

2. after all (because of, for the reason)

   Natürlich liebe ich dich, du bist ja schließlich meine Tochter.

   Of course I love you, after all, you are my daughter.