Trying to add an accessible definition of the DI in the glossary

l3ackslash0 · weaverryan · commit 0ad55aed74b1 · 2013-09-18T10:09:28.000-05:00
diff --git a/glossary.rst b/glossary.rst
@@ -11,6 +11,16 @@ Glossary
         selection of bundles, a sensible directory structure, a default
         configuration, and an optional configuration system.
 
+   Dependency Injection
+        The Dependency Injection is a design pattern highly used in Symfony2 Framework.
+        It encourages less coupled and more maintainable architecture of an application. 
+        The main principle of this pattern is that it allows developers to *inject* objects 
+        (also known as services) in other objects, passing generally it as parameters.
+        Different levels of coupling between these objects can be established  
+        depending on the method used to inject objects together.
+		The Dependency Injection pattern is the more often associated 
+        to an other specific type of object: the :doc:`/book/service_container`
+
    Project
         A *Project* is a directory composed of an Application, a set of
         bundles, vendor libraries, an autoloader, and web front controller
