When we deal with different information systems in an enterprise, we unfortunately deal with problems of integrating and developing systems and databases in heterogeneous, distributed environments. In the last decade, the ontologies are used in order to make understandable the data, and to be a support for system’s interoperability problems. As shared common vocabulary, the ontologies play a key role in resolving partially the semantic conflicts among systems. Since, different applications of the same domain have several representations of the same real world entities; our aim is to propose MurO: a Multi-representation ontology. The latter is an ontology characterizing the concepts by a variable set of properties (static and dynamic) or attributes in several contexts and in several scales of granularity. We introduce, in this paper, the multirepresentation requirements for ontologies. We develop, as well, a formalism based on Modal Description Logics for coding MurO ontologies. Then, we show its use with the ongoing EISCO (Enterprise Information System Contextual ontology) project and its relevance for answering the motivating requirements.