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A nonagenarian is a person who is ninety, ninety-one, ninety-two… all the way up to ninety-nine. Not a hundred yet — that person is a centenarian, a different word. We use it as a noun (she is a nonagenarian) and also like an adjective (a nonagenarian painter). It is a rather formal, slightly word. At a family dinner you are far more likely to hear she's in her nineties or she's ninety-four. Newspapers, doctors, and people writing carefully about old age like nonagenarian because it is neat and exact. It does not mean “very old” in a vague way. A person of eighty-eight is not a nonagenarian, even if they seem ancient to you. The Latin piece means “ninety”; English took the word from that, sometimes through French.
九旬老人（九十到九十九歲）
組成Latin nōnāgēnārius (“containing ninety”) + English -an, from nōnāginta (“ninety”, “nine tens”), either directly or via French nonagénaire.
同家族的字
- octogenariansame Latin age-word pattern, for someone in their eighties
- septuagenariansame pattern, for someone in their seventies
- centenariansame -arian pattern, for someone who is a hundred
原始詞典資料2 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。
nonagenariannoun/ˌnɑnəd͡ʒɪˈnɛriən/
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Synonym of ninetysomething: a person between 90 and 99 years old.
nonagenarianadj/ˌnɑnəd͡ʒɪˈnɛriən/
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Of or related to ninetysomethings.
- "But what’s that got to do with your health and longevity?" the neighbor inquired. "Why," said the nonagenarian, "I've spent most of my life in the open air."
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。