constant

1. Origins, structure, and basic meaning

• Structure: 恒 has 9 strokes, the on-reading こう, and the kun-reading つね. 恒例 (こうれい) and 恒久 (こうきゅう) concern recurring custom and lasting duration.
• Basic usage: 恒例 means an established recurring practice; 恒久 describes something permanent or lasting.

2. Common pitfalls and similar expressions

• A recurring custom and lasting duration
  • 恒例行事 means a customary event; the spring-cleanup example describes an annual one. 写真を撮るのが恒例になった means that taking a photograph together became a tradition.
  • 恒久的な橋 means a permanent bridge replacing a temporary one. 恒久の平和 refers to lasting peace.