Figure: RROM for morphological lexicon.
A morphological lexicon database, as MULTEXT [Ide and Véronis1994], usually associates an inflected word to a set of lemmas and a set of features. Reversible access is needed for generation for example. A lemma is an abstract entity that is represented with a normal form of a word (the entry of a dictionary) and can be realized with all possible flexions of a word. We can distinguish as ressources entities inflected words, lemma and morphological features (including a category) that will characterize the inflection. An inflection is a relation between one inflected word, one lemma and a set of morphological features. Depending on the sense that one follows this inflection relation (from the lemma or from the inflected word), we obtain a reversible access. Each lemma is characterized by a link to one inflected word which is the normal form that identify this lemma (see figure 1). Respectively, an inflected word is not always the normal form of a lemma.