My question still stands, where is graphics involved in this definition?I suppose it comes from 'Pro' being the short form of 'Professional':
Noun
1 A person engaged or qualified in a profession: professionals such as lawyers and surveyors.
2 A person engaged in a specified activity, especially a sport, as a main paid occupation rather than as a pastime
3 a person competent or skilled in a particular activity
So I guess if you do something with a level of competence or skill, and/or get paid for that, you'd be a Pro. The problem is I think it's become a much abused term, generally applied to things that have more 'features' and cost more.