MultiWordNet is a multilingual lexical database in which the Italian WordNet is strictly aligned with Princeton WordNet 1.6.

The Italian synsets are created in correspondence with the Princeton WordNet synsets, whenever possible, and semantic relations are imported from the corresponding English synsets; i.e., we assume that if there are two synsets in PWN and a relation holding between them, the same relation holds between the corresponding synsets in Italian. While the project stresses the usefulness of a strict alignment between wordnets of different languages, the multilingual hierarchy implemented is able to represent true lexical idiosyncrasies between languages, such as lexical gaps and denotation differences.

MultiWordNet website