Natural morphology

Natural Morphology is a theoretical model developed by morphologists such as Dressler and Wurzel. They seek to provide a theory of what constitutes a 'natural' or 'unmarked' morphological system, and what laws govern deviations from that natural system. The most natural type of morphology is fully transparent, in the sense that every morpheme has one form and one meaning, and every meaning corresponds to exactly one form. This relation is called biuniqueness.

Links
Utrecht Lexicon of Linguistics