This is the 1442nd most frequent Japanese word.
治安
"治安" means "public order" or "security."
治安 refers to the general state of safety and public order.
日本の都市部の治安は比較的良いです。
The safety of urban areas in Japan is relatively good.
治安 refers to the condition of public safety and the risk of danger.
治安が悪い地域は避けるべきです。
You should avoid areas where safety is poor.
治安 is used in context of improvement or decline in public safety.