I have seen the acronym "AEDU" (or perhaps ADEU) used on the community boards at wizards.com, but haven't stumbled on the definition, and a google search goes nowhere (I doubt they're suddenly saluting in Catalan). It seems to have something to do with wizards, but what does it mean?
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It refers to the basic structure of the powers that balances the classes and keeps the approximate effectiveness of powers between classes equal. (i.e. a 5th level daily in any class is approximately on par with a 5th level daily in any other class.)
At-Will, Encounter, Daily, Utility
Old classes had all of their powers within those types, while new Essentials classes dabble in modifying Basic Attacks.