Fact is, most of it isn't earned. At max benefit, it only takes a few years to get paid back all you paid into for Social Security. Past that it is an entitlement just like any other. The same with Medicare. There is no fund, there is no interest, it's all a Ponzi scheme and if the government wasn't going it, it would be illegal.
You realize that the definition you cite doesn't have one bit to do with what is classed as an entitlement from the government. It is labeled that because people who collect it are "entitled" to it because of law, not because they paid anything in or even at all. Any other idiotic semantic arguments you want to make?