That's a good definition of rich everywhere but what you will spend your money on decides the level of richness. If I have 10 million dollars I can do whatever I want and I wouldn't ever need money ever again, some people look for houses that worths at least 10 million dollars, so as you can see there are differences, for me about 200k for a house is more than enough, that would be a very decent house as well and not like some small flat neither, and I can get one for my parents as well near me so 400k for houses, rest could go to bank for interest and I could basically live with the rest of that easily, we are talking about at least 9 million dollars even if I find a way to spend the other 600k, and the interest of that would be more than enough for me to live happily ever after.
BUT there are some people who would see 10 million as not nearly enough and want more, we all do the same, have a house, have our family, pay for everything we "need" and yet the numbers are so different.
It's absurd but yeah for me my kind of definition of rich was the way people are spending their wealth usually a liesure one, spending on their properties and luxurious lifestyle. But there also some rich people alive that doesn't have a very luxurious life, no more liesure times and liesure trips and life but still rich. And at some point I do consider some people rich already if they have manage to earn for themselves $10,000 -$12,5000 a month or having an assets of real state investment and a bank account of $25,000 up.