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+**Definition of terms**
+
+Different SDOs and communities use different terminology related to
+NFV/Cloud/SDN. This list tries to define an OPNFV terminology,
+mapping/translating the OPNFV terms to terminology used in other contexts.
+
+.. glossary::
+
+   NFV
+      Network Function Virtualization
+
+   NFVI
+      Network Function Virtualization Infrastructure; totality of all hardware
+      and software components which build up the environment in which VNFs are
+      deployed.
+
+   VNF
+      Virtualized Network Function. Implementation of an Network Function that
+      can be deployed on a Network Function Virtualization Infrastructure (NFVI).
+
+   VIM
+      Virtualized Infrastructure Manager; functional block that is responsible
+      for controlling and managing the NFVI compute, storage and network
+      resources, usually within one operator's Infrastructure Domain, e.g. NFVI
+      Point of Presence (NFVI-PoP).
+
+   NFVO
+      Network Functions Virtualization Orchestrator; functional block that
+      manages the Network Service (NS) lifecycle and coordinates the management
+      of NS lifecycle, VNF lifecycle (supported by the VNFM) and NFVI resources
+      (supported by the VIM) to ensure an optimized allocation of the necessary
+      resources and connectivity.
+
+   VNFM
+      Virtualized Network Function Manager; functional block that is responsible
+      for the lifecycle management of VNF.
+
+   Consumer
+      User-side Manager; consumer of the interfaces produced by the VIM; VNFM,
+      NFVO, or Orchestrator in ETSI NFV [7] terminology.
+
+   Administrator
+      Administrator of the system, e.g. OAM in Telco context.
+
+   Virtual Machine (VM)
+      Virtualized computation environment that behaves very much like a physical
+      computer/server.
+
+   Virtual Storage
+      Virtualized non-volatile storage allocated to a VM.
+
+   Virtual network
+      Virtual network routes information among the network interfaces of VM
+      instances and physical network interfaces, providing the necessary
+      connectivity.
+
+   Physical resource
+      Actual resources in NFVI; not visible to Consumer.
+
+   Virtual resource
+      A Virtual Machine (VM), a virtual network, or virtualized storage; Offered
+      resources to "Consumer" as result of infrastructure virtualization; visible
+      to Consumer.