Translation of aditivo

I have studied French for many hours per week, and I've even lived in Geneva for a while... my French was good than. Today, I have forgotten most of it. I have to re-learn and Vocabulix can help.
The differences between Italian and Spanish are very small. But I see that you speak Spanish better than I speak English. It is still far from perfect, but that is already a start.
I think Italian so beautiful, I should definitely learn more! In addition, my husband and I are getting married next year and we will move to Italy. He is originally from Palermo, Sicilia.