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Terrorism is the systematic use of terror, often violent, especially as a means of coercion. In the international community, however, terrorism has no legally binding, criminal law definition.[1][2] Common definitions of terrorism refer only to those violent acts which are intended to create fear (terror); are perpetrated for a religious, political or, ideological goal; and deliberately target or disregard the safety of non-combatants (civilians). Some definitions now include acts of unlawful violence and war.

But then, let's apply this to the Iraq war

Was Blair using it as a means of coercion? Yup.

Did it involve violence? Sure.

Was it intended to create fear among Saddam and his party? Definitely.

Was it perpetrated for a political or ideological goal? Not half!

Was the safety of non-combatants disregarded? Unfortunately yes.

Starting to see the problem with the "T word"?

It's completely subjective.