[arcastroe]

I don't think this is strictly needed. An English dictionary may seem pointless because it defines every word using only other English words. But the meaning is contained in the _relationship_ between the words.

I'm sure you've seen the example of word vectors that captures some of this meaning. king - man + woman = queen

In Spanish, rey - hombre + mujer = reina

The _relationship_ between "king" and "queen" in English may look close enough to the _relationship_ between "rey" and "reina" in Spanish, allowing you to bridge the gap between the two languages, even if they are entirely disconnected and you've never seen a direct translation between them.