公共

1. Origins, structure, and basic meaning

• Structure: 公共 (こうきょう) is a noun-like expression for something public or shared by society or a community.
• Basic usage: It modifies places and facilities in combinations such as 公共の場所 and 公共施設.
  • 公共の場所では周りの人に配慮しましょう。 — Be considerate of others in public places.
  • 町は古い倉庫を公共施設として活用しています。 — The city is using an old warehouse as a public facility.

2. Common pitfalls and similar expressions

• Public and private
  • 公共 concerns society or the community rather than one private individual. 公共施設 is a facility serving that public purpose.