What does this mean? In particular, what does "universal" mean?

It means that each person in the country would, if ey got sick, be able to receive affordable treatment. This is true in, for example, Great Britain, where the NHS pays for people's medical care regardless of their wealth. It is not true in the United States, where people who cannot afford health insurance and do not have it provided by their employer go without needed treatments because they can't afford them.

ETA: does someone think this definition is wrong? What's another definition I'm missing?