What defines mid-fi versus high-end?

I’m in my mid fifties and I recall 30 years back mid-fi to me fell into the NAD, Adcom, B&K…. For high-end I considered Mac, some of the Counterpoint offerings, Cary…. so forth.  I had another post going where I mentioned I acquired an Onkyo  home theater receiver that retailed new for $1,100.   Yet another agoner responded that it does not rate as mid-fi.   We all have our opinions of course.   So right or wrong here.
How do you define the parameters of high-end versus mid-if?  By money range, by brand…?