define the world!

While driving home yesterday:
- c'est quoi " le Monde" maman?
- Ah mon petit...
  en Arabe, c'est " Al Dunia"
- oui, mais c'est quoi?
-mmmmmm.......

I love my 4 years old-boy's questions!
I mean, when was the last time you were asked to define "the world"????
this is really challenging and cute...
I freak out thinking of way more complicated terms he would ask about...