治安|ちあんchian[0]heiban (flat)

1. nounpublic order; public peace; public security; law and order

• Synonym公安こうあんWrittenWritten/formal term for public safety and order, also the security police; leans official/administrative, while 「治安」 focuses on how good or bad social order is.
• Antonym乱れみだれNeutralNeutral term for disorder or turmoil, as in 「風紀の乱れ」; the opposite of stable 「治安」.
• Antonym騒乱そうらんWrittenWritten/formal term for a riot or violent disturbance, as in 「騒乱罪」; the opposite of good 「治安」.

Use 「治安」 for social order and safety, as in 「治安が悪い」; 「公安」 for public safety or the security police in official contexts; 「乱れ」 for disorder, 「騒乱」 for riots.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 国家こっかや社会しゃかいの秩序ちつじょが保たもたれ穏おだやかなこと。