This master thesis investigates underlying principles and usage-based aspects of lexical blending. In a corpus study examining the lexical items, or matrix words, republican, liberal, and vegetarian it was found that there were three cognitive constraints influencing their potential to form blends. Mapping of a prefixation schema onto the lexical item republican was shown to fuel blend formation. Neighborhood effects and morphological lexicalization, on the other hand, were observed to have a negative influence on the possibility to form blends from the terms liberal and vegetarian. Also, an examination of word class distribution in the matrix words and their blend and compound derivatives showed that the patterns of the blends were less co...