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Decease means death, but it is a stiff paper word, not a kitchen-table word. You meet it in law, hospital forms, and very formal writing: upon the decease of the owner, date of decease. A family talking about someone they love would say when he died, after her death, or she passed away — not after her decease. There is also a verb, to decease, meaning to die, but it is even rarer and sounds old, as if copied from a document. People reach for this word when they want distance and , as if dying were a kind of leaving, which is the old idea behind it. In speech it can sound cold, or like you are showing off a legal vocabulary.
亡故、死亡（書面／法律用語；口語說「過世」「去世」）
組成From Old French deces (modern French décès), from Latin dēcessus, “a departure” — death talked about as a leaving.
同家族的字
- deceaseddecease + -ed: the person who has died
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
deceasenoun/dɪˈsiːs/
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formalDeath, departure from life.
- So should that beauty which you hold in lease Find no determination: then you were Yourself again after yourself's decease […]
- I thought about my predecessor, who had died of drink and smoke; and I could have wished he had been so good as to live, and not bother me with his decease.
deceaseverb/dɪˈsiːs/
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archaicTo die.
- After which usurped victorie, he presently deceased: and partly through the excessive joy he thereby conceived.
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formalTo cause to die.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。