One more thing. Don’t confuse “Anarchism” for “Libertarianism”. In an Anarchist model described by Marx, there is a Government, but it is rendered completely ineffective.
A Libertarian model is what you meant, because it is a system by which Government effectively executes few and necessary laws to ensure civility and the security of the people.
I guess my opinion on the definition is slightly different. My defintion of anarchism is that there is no central govt or other pro forma govt. Just people doing what they want within the parameters of their “tribes” social norms and standards. One could liken my intrepretation to the American Indian tribes. Each lived according to their own rules and accepted norms.