Amidst this rapid explosion of interest in eGovernment there is absent a clear definition of the concept and its domain. We review the extant definitions of the term and present an ontology of eGovernment to articulate its combinatorial complexity. The ontology parsimoniously encapsulates the logic of eGovernment. It moves away from technology-based conceptualizations to a systemic one. It makes the ‘elephant’ visible. It can be used to articulate the components and fragments which constitute eGovernment using structured natural English sentences and phrases. It serves as a multi-disciplinary lens to study the topic drawing upon concepts from information systems, knowledge management, public administration, and information technology. The ontology can be used to systematically map the state-of-the-research and the state-of-the-practice in eGovernment, discover the gaps in research and between research and practice, and formulate a strategy to bridge the gaps.