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This is the number word we use for something in position 15, right after 'fourteenth' and before 'sixteenth'. We also use it for dates, like 'the fifteenth of May' (May 15th). You will usually see it written as '15th'.
第十五（的）
組成fif- (from 'fifteen') + -th (the ending we add to make an ordinal number, like fourth, fifth)
同家族的字
- fifteenthe number this comes from
原始詞典資料4 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。
fifteenthadj/ˌfɪfˈtiːnθ/
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The ordinal form of the number fifteen.
fifteenthnoun/ˌfɪfˈtiːnθ/
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The person or thing in the fifteenth position.
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One of fifteen equal parts of a whole.
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entertainmentlifestylemusicThe interval comprising two octaves.
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。