What are/is the accurate definition of gambling on you based on the definition above?
This is highly subjective. You will never able to find your final concrete conclusion for the definition of gambling. Because, basically all the people are not gambling for same reasons and we cannot find the actual intentions of a gambler why they are into gambling. But, the broad definition of gambling could be source of entertainment and source of income.
Let's make it simple for OP,gambling is for us to.lose and for the owners to become richer.that's the reality here and let us not make many explanations.
If you want to earn money from this then for sure you will.lose.
If you want to enjoy then you are a winner (by Fun)