What is the meaning of the word "babylon"?

Definitions:

A major city in ancient Mesopotamia, known for its wealth, advanced civilization, and impressive architecture. NOUN
- Babylon was a center of learning and culture in the ancient world.
Used metaphorically to refer to places or systems characterized by excess, decadence, or corruption. NOUN
- To many Rastafarians, Babylon represents oppressive societal systems and institutions.