64fa7814_jdeveloper___Eddie_Awad_s_Blog__Meaning
[Acronym] OPMN [Description] OPMN is installed and configured with every Oracle Application Server installation type and is essential for running Oracle Application Server. OPMN enables you manage your Oracle Application Server instance in an hierarchical fashion as part of a cluster topology. [Meaning] 
Oracle Process Manager and Notification
jdeveloper » Eddie Awad's Blog
Meaning