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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::
+
+    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.
+
+    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.
+
+    VNF
+        Virtualized Network Function. Implementation of an Network Function that
+        can be deployed on a Network Function Virtualization Infrastructure
+        (NFVI).