The world or realm of criminal gangs; gang culture or the organized criminal underworld collectively.
Compound word: gang + -dom (a suffix meaning 'domain' or 'realm'), similar to kingdom or Christendom. The term emerged in 20th-century American English to describe the environment and culture of organized crime.
The suffix '-dom' creates words about whole worlds or kingdoms (kingdom, Christendom, gangdom)—it lets us talk about an entire culture or system as one unified thing!
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