- 旬 — season (for food, produce)
- 初旬 — first 10 days of the month
- 中旬 — middle 10 days of the month
- 下旬 — last 10 days of the month
- 旬報 — periodical report (issued every 10 days)
- 旬刊 — ten-day magazine/publication
旬 originally meant a period of ten days. Over time, it came to mean “the best time” — especially for foods in season, like旬の野菜 (seasonal vegetables). The association of freshness and timing remains central to its meaning today.