Undestandable Jasp, hope you enjoyed it 
Now back on topic, There is no such thing as arabism nor africanism. The Arabian Union is only there to discuss political and economical problems the Arab countries suffer from and look out for a way to support those countries in the way all the arab countries agree on. While the African Union cares about other political issues that African countries suffer from and find a way to support them.
In other words, both the African and the Arabian union work for the sake of the Arabian African country and two hands are better than one for sure, so I can't see how they are both contradicting to you. And with so many countries being part of those two unions simultaneously they must have been benefiting from it else they won't still be there in both of them.
Now back on topic, There is no such thing as arabism nor africanism. The Arabian Union is only there to discuss political and economical problems the Arab countries suffer from and look out for a way to support those countries in the way all the arab countries agree on. While the African Union cares about other political issues that African countries suffer from and find a way to support them.
In other words, both the African and the Arabian union work for the sake of the Arabian African country and two hands are better than one for sure, so I can't see how they are both contradicting to you. And with so many countries being part of those two unions simultaneously they must have been benefiting from it else they won't still be there in both of them.
How do you define an Arab?
This is probably the easiest definition -
An Arab (عربي, ʿarabi) is a person who identifies as such on linguistic or cultural grounds. The plural form, Arabs (العرب al-ʿarab), refers to the ethnocultural group at large.
If you were asking what i view as an arabic country then that is a different question. It is based on geographic lines, it is (from the course i am studying on middle east history) The arabic penisula going north to Istanbul/The Crimea, East to the Suez Canal (although usually including all of egypt) and east to Iran.
