1. arbitrary or unrestrained exercise of power; despotic abuse of authority.
2. the government or rule of a tyrant or absolute ruler.
3. a state ruled by a tyrant or absolute ruler.
4. oppressive or unjustly severe government on the part of any ruler.
5. undue severity or harshness.
6. a tyrannical act or proceeding.
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http://dictionary.reference.com/browse/tyrannyNoe - doesn't seem to be on the list, except insofar as the President wishes to subordinate the powers of the Judicial Branch and the Legislative Branch to himself. But he has not as yet been successful in this goal; frankly it seems like it's going the other way.
Bryant
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