I'm aware of the definition, instead of replying with semantics you could try to outline the specifics of your defense of it.
From how I see it, in no morally relativistic sense do I see how making more money means I should have to forfeit more of my income because that's what's decided to be right and just by people who make less money.
I think if someone claims they have a bigger claim on my money because I earn more, you must PROVE why that is.