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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
entity-relationship model
entity-relationship diagram
ERD
An approach to data modelling
proposed by P. Chen in 1976. The model says that you divide
your database in two logical parts, entities (e.g. "customer",
"product") and relations ("buys", "pays for").
One of the first activities in specifying an application is
defining the entities involved and their relationships,
e.g. using an entity-relationship diagram to represent a
model.
["The entity-relationship model: toward a unified view of
data", P.P. Chen, ACM Transactions on Database Systems 1:1 pp
9-36, 1976].
(2009-11-21)