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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+**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::
+
+    ACT-STBY configuration
+        Failover configuration common in Telco deployments. It enables the
+        operator to use a standby (STBY) instance to take over the functionality
+        of a failed active (ACT) instance.
+
+    Administrator
+        Administrator of the system, e.g. OAM in Telco context.
+
+    Consumer
+        User-side Manager; consumer of the interfaces produced by the VIM; VNFM,
+        NFVO, or Orchestrator in ETSI NFV [ENFV]_ terminology.
+
+    EPC
+        Evolved Packet Core, the main component of the core network architecture
+        of 3GPP's LTE communication standard.
+
+    MME
+        Mobility Management Entity, an entity in the EPC dedicated to mobility
+        management.
+
+    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.
+
+    S/P-GW
+        Serving/PDN-Gateway, two entities in the EPC dedicated to routing user
+        data packets and providing connectivity from the UE to external packet
+        data networks (PDN), respectively.
+
+    Physical resource
+        Actual resources in NFVI; not visible to Consumer.
+
+    VNFM
+        Virtualized Network Function Manager; functional block that is
+        responsible for the lifecycle management of VNF.
+
+    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.
+
+    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).
+
+    Virtual Machine (VM)
+        Virtualized computation environment that behaves very much like a
+        physical computer/server.
+
+    Virtual network
+        Virtual network routes information among the network interfaces of VM
+        instances and physical network interfaces, providing the necessary
+        connectivity.
+
+    Virtual resource
+        A Virtual Machine (VM), a virtual network, or virtualized storage;
+        Offered resources to "Consumer" as result of infrastructure
+        virtualization; visible to Consumer.
+
+    Virtual Storage
+        Virtualized non-volatile storage allocated to a VM.
+
+    VNF
+        Virtualized Network Function. Implementation of a Network Function that
+        can be deployed on a Network Function Virtualization Infrastructure
+        (NFVI).
+
+..
+ vim: set tabstop=4 expandtab textwidth=80: