Assault rifle - Semiautomatic - Full Automatic - ???

I set out to explain the difference between semiautomatic and full automatic, also the term assault rifle. I found very quickly that there is so much confusion and deliberate deception in print that it is impossible to explain. That said, unless you know the difference yourself it is a waste of time searching for the definition.
So here is my take:

Assault rifle:
a rapid-fire, magazine-fed automatic rifle designed for army infantry use.
This means it can be full automatic firing - keep the trigger pulled and it keeps firing.
Illegal for civilian purchase.

Semiautomatic:
You must pull the trigger each time the weapon fires. Most are legal for civilian purchase. miss-Called Assault rifles by news media and people that don't know what they are talking about.

Full Automatic:
keep the trigger pulled and it keeps firing until the trigger is released. Illegal for civilian purchase.