In this paper, we present an ongoing lexicographical work undertaken by the research laboratory /LexSem at the Autonomous University of Barcelone and the LDI at the University of Paris 13. The goal of our research is to build a system of coordinated monolingual dictionaries for machine translation (Spanish/French). In order to illustrate our methodological approach, we will focus on the description of the predicate adjectives in Spanish by using the model of the classes of objects. We underline the benefits of such a description and some problems encountered from a bilingual perspective Spanish-French. Finally, we introduce a new global semantic description of adjectives by means of the concept of grammatical meaning.