n.

1. 晴朗，風和日麗[U]
   He was always a cool man; nothing could disturb his serenity.

   他總是非常沉著；沒有什麼東西能打亂他的平靜。

2. 平靜，沉著[U]
3. （大寫）尊貴的閣下（對歐洲某些王室成員的尊稱）
4. 寧靜
   The residents of this community are proud of its serenity, especially at night.

   這個社區的住戶以它的寧靜為傲，尤其是在晚上。