There are probably as many definitions of IT Infrastructure as there are IT organizations. I believe the following definitions are representative and appropriate:
IT Infrastructure: “IT infrastructure consists of the equipment, systems, software, and services used in common across an organization, regardless of mission/program/project. IT Infrastructure also serves as the foundation upon which mission/program/project-specific systems and capabilities are built.” from cio.gov
ITIL defines infrastructure more like: All of the components (Configuration Items) that are needed to deliver IT Services to customers. The IT Infrastructure consists of more than just hardware and software.
Additionally, for project planning purposes I believe IT Infrastructure should be subdivided into several components:
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