Its development started in the BalkaNet project. At the moment, it contains 59,348 synsets, in which 53,092 words with 85,227 senses occur. There are 2,216 nonlexicalized synsets. RoWN is aligned to Princeton WordNet 3.0 (PWN). There are 541 synsets not aligned to (PWN), as they are considered Balkan-specific concepts and no corresponding one was identified in (PWN). There are 138,592 relations in RoWN.