1.
neighborhood, vicinity, area
A geographical area or neighborhood, typically referring to the surroundings of a specific location.
駅界隈には飲食店が多い。
There are many restaurants in the area around the station.
2.
community, scene, fandom
A group of people with shared interests, particularly used online to refer to fan communities or subcultures. Modern slang usage.
あの界隈では有名な人だ。
They're famous in that community.
アニメ界隈で話題になっている。
It's become a hot topic in the anime community.
推し活界隈の人たちと繋がった。
I connected with people in the idol fan community.
推し活 = supporting one's favorite idol
REGISTER: Neutral in sense 1; casual/slang in sense 2.
TRADITIONAL USAGE (sense 1):
The original meaning refers to a geographical area or neighborhood, as in 銀座界隈 (the Ginza area).
MODERN SLANG (sense 2):
Since the 2010s, 界隈 has become popular online to refer to communities based on shared interests:
- ゲーム界隈: gaming community
- コスプレ界隈: cosplay community
- Vtuber界隈: VTuber fandom
RELATED EXPRESSIONS:
- 界隈民: members of a community
- 〜界隈で炎上: to cause controversy in a community
NOTE: In online contexts, 界隈 can sometimes have slightly negative connotations, implying an insular or drama-prone community.