Pretty good definition. We know these kinds of distinctions have plagued sports in the past. Keep in mind that the 2004 space shot is often referred to as the first civilian space launch. So, amateur or civilian; what's the difference? How about amateur, student, civilian, and professional? (don't really want an answer I guess).
Amateurs become professionals all the time. Can they go back? Anyway, look at the relationship of the Civilian Space Exploration Team (CSXT) and Up Aerospace. Also, maybe Rocketman Enterprises, Jerry Larson and who started Up Aerospace and it's officers. Is Jerry a professional rocket man too? So, was the 2014 launch the 2nd successful amateur launch to space and the altitude record holder? Who's motor did they use? Who built it?
We all use commercial components to varying extent. For example, I don't make most of my electronics, I buy them. Some people purchase a lot of components, including motors and complete fin cans. If I bought everything, had someone put it together for me, and launched it to space, would I be the 3rd amateur space flight? Good example of why I don't like the 1st, 2nd, whatever thing. I prefer to focus on accomplishments and advancements.
Can an amateur build a hybrid, mono-propellant, or bi-propellant rocket and launch it to space? You bet they could! It's probably going to happen. 1st Amateur bi-propellant rocket to space. But, what if the first stage is bi-propellant and sustainer is solid. Oh boy...