What is the meaning of ER model?
ER stands for entity-relationship. An ER model describes the application's entities and the relationships between them. Typically, this model is best represented as a diagram.
The following resources have further information:
Entity-Relationship model
definition from WhatIs.com
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Methods of depicting a data model
expert answer from SearchOracle.comThe Entity-Relationship Model
tutorial from the University of TexasEntity Relationship Diagram (PDF)
comprehensive reference from Cornell University
Oracle White Papers: Fusion Middleware