The enterprise information systems (EIS) offer the cornerstone for managing enterprise business, applying strategic and economical decisions, and holding communication with partners. Bringing systems to work together is becoming increasingly essential for leveraging the enterprise information systems and reaching common goals. Meanwhile, semantic sharing represents the daunting barrier for making these systems work together through a more convenient global architecture and providing interoperability and reusability. This paper concentrates on studying the application of tightening together context and ontologies which can serve as formal background for reaching a suitable global enterprise environment. It brings along architecture and implementation, with special interest for the reusability of components between these systems.