All of the definitions here painting Cambridge, Massachusetts as some playground for the ultra-elite are dead wrong. Cambridge isn't even rich compared to most parts of Greater Boston; in fact, most of Cambridge is straight-up working class.
This is how it should be defined:
1. The best part of Greater Boston. Owns every other part (North End, Southie, Brookline, Newton, Roxbury, Dorchester, Somerville, Medford, etc.) in every way possible. No other borough/neighborhood/neighbor city even compares to this place. There is always something to do, ALWAYS.
2. A progressive city with a rich history. Home to some of the highest ranked universities and highest percentage of Democrat voters.
3. The only place in the world where Harvard and MIT professors live next door to immigrant families on food stamps, who in turn live next door to high-profile lawyers, who live next door to Wobblies, who live next door to old-New England money grandparents, who live next door to Harvard frat boys.
I love going to Cambridge to hang with all the hipsters in Harvard Square. Then afterwards I always stop to eat at the best Indian food places outside of Delhi. Once I'm done that I usually go protest some shit with the socialists in Cambridgeport. I could live here forever.