In this study the emphasis will be on zero morpheme which is not studied so much in Turkish. Zero morphemes are phsically not present in surface, no phonetic representation, yet fulfill the whole grammatical requirement of language. Zero morphemes are represented with this symbol “Ø”. Like lots of languages, zero morphemes exist in Turkish also. Unlike some of the languages zero morphemes in Turkish doesn’t tie to a rule. In this study, initially the theory of zero morphemes will be explained accordingly to the literature, then whether the genitive and nominative case which are made without any affix in Old Anatolian Turkish (13.-15. century) can be explained with zero morpheme theory or not will be disscussed. In order to discuss this topic a corpus has been compiled covering Old Anatolian Turkish. Then the examples which were compiled from the corpus will be analysed in the morphonomic and phonomic level.
Zero morpheme, Old Anatolian Turkish, Morphonomic level, Phonomic level, Corpus.