Huh? I ask for the definition of "terrorism" that you're using and I get this...this lecture by you on which dictionaries ought to matter most to me? Gawd, dude, let's start all over again...how do you define terrorism? Which definition are you yourself using when you say the US Army is the largest terrorist group in the history of the world?
For a minute there, I thought you were relying on one or another government definition of terrorism, but I guess you're just a fan of running to the nearest dictionary. Do you even know how word definitions in a dictionary are compiled? I do, but I doubt you do, or you wouldn't be so quick to run to them.
Here's the
Oxford def. that you like: "The unofficial or unauthorized use of violence and intimidation in the pursuit of political aims" I don't see how that results, as you have suggested, in the US Army being the largest terrorist organization in the world.
Note the differences between the Oxford definition of terrorism and these definitions:
The
CIA defines terrorism according to Title 22 of the US Code, Section 2656f(d): "The term "terrorism" means premeditated, politically motivated violence perpetrated against noncombatant targets by subnational groups or clandestine agents."
The FBI definition is a bit more lengthy than the CIAs and can be read
here.
There are also definitions of terrorism in use by the US Military, and by various other governments and international bodies. You should look some of those up to get a feeling for how much diversity there is in how the word is defined.