The precise definition of what separates a sport from other leisure activities varies between sources. The closest to an international agreement on a definition is provided by SportAccord, which is the association for all the largest international sports federations (including association football, athletics, cycling, tennis, equestrian sports and more), and is therefore the de facto representative of international sport.
SportAccord uses the following criteria, determining that a sport should:
- have an element of competition
I don't think anyone is going to argue about this one.
- be in no way harmful to any living creature
Cows?
- not rely on equipment provided by a single supplier (excluding proprietary games such as arena football)
It doesn't.
- not rely on any "luck" element specifically designed into the sport
Hmm, some tables definitely have luck designed into them (e.g. random awards), but as a whole pinball doesn't rely on luck. Furthermore, random elements can often be disabled.