My definition is you are rich if you don't have to work to live. If your continued survival depends on selling your labor for money, you're not rich. If you survive based on the ownership of assets rather than selling your labor, you are rich.
Which is, of course, itself a relative measure. There are probably many on this site with 1 million in assets. With that in the bank, you could live in comfort indefinitely in my part of the Midwest.
