GermaNet is a lexical semantic network that is modeled after the Princeton WordNet for English. It partitions the lexical space into a set of concepts that are interlinked by semantic relations. A semantic concept is modeled by a synset. A synset is a set of words (called lexical units) where all the words are taken to have (almost) the same meaning. Thus a synset is a set-representation of the semantic relation of synonymy, which means that it consists of a list of lexical units. There are two types of semantic relations in GermaNet. Conceptual relations hold between two semantic concepts, i.e. synsets. They include relations such as hypernymy/hyponymy (is-a relationship), meronymy/holonymy (part-whole relations), entailment/is entailed by, or causation/is caused by. Lexical relations hold between two individual lexical units. Antonymy (a pair of opposites) and pertainymy (for denominal adjectives) are examples of lexical relations.