Who Is A Terrorist?

I read an article asking: Who is a terrorist?

Merriam-Webster Dictionary ter·​ror·​ism | \ ˈter-ər-ˌi-zəm

: the systematic use of terror especially as a means of coercion

ter·​ror·​ist | \ ˈter-ər-ist

: an advocate or practitioner of terrorism as a means of coercion

I hope this clears it up.