Wikipedia
PlWordNet
plWordNet – a lexico-semantic database of Polish language. It includes sets of synonymous lexical units ( synsets) followed by short definitions. plWordNet serves as a thesaurus-dictionary where concepts (synsets) and individual word meanings ( lexical units) are defined by their location in the network of mutual relations, reflecting the lexico-semantic system of Polish language. plWordNet is also used as one of the basic resources for the construction of natural language processing tools for Polish.