15番目
解説 Definition
fifteenth は fifteen（15）に対応する序数で、15番目という意味です。順番や順位、日付の15日を表すときに使われます。
The person, thing, or position that comes after the fourteenth in an ordered series. As a noun, it can also mean the fifteenth day of a month, as in “on the fifteenth.”
覚え方のコツ Memory Tip
fifteenth は fifteen「15」に序数の -th を付けた語で、「15番目」や「15日」を表す。綴りは fifteen + th のまま、発音は /ˌfɪfˈtiːnθ/。the fifteenth student、the fifteenth page、on the fifteenth の型で覚え、five に対応する fifth「5番目」と混同しない。
Build fifteenth from fifteen plus the ordinal ending -th. The spelling keeps the full word fifteen and adds th, and the pronunciation ends in /nθ/: /ˌfɪfˈtiːnθ/. Use it in fixed patterns such as the fifteenth student, the fifteenth page, and the fifteenth of May. These show its two common jobs: marking position in a sequence and naming a date. Do not confuse it with fifth, which corresponds to five, not fifteen. A useful mental check is that the visible element teen must remain whenever the number is fifteen.
例文
She was the fifteenth student in line.
彼女は列の15番目の生徒でした。
My birthday is on the fifteenth of May.
私の誕生日は5月15日です。
This is the fifteenth page of the book.
これはその本の15ページ目です。
fifteenth の類義語・関連語
紛らわしい語
fifteenth の語源・成り立ち Etymology
fifteenthは fifteen + -th「序数語尾」から成ります。fifteen は古英語 fiftene で、five に ten が加わった形、-th も古英語由来です。関連語に fifth、fifty。もともと「五と十でできた数の順番」なので、15番目という意味になります。
Fifteenth is formed from fifteen and the ordinal suffix -th. Fifteen continues Old English fīftēne, literally expressing five added to ten, while -th descends from an Old English suffix used to create ordinal numbers. The spelling preserves fifteen before the suffix, unlike fifth, whose form developed from five with older sound and spelling changes. Its structure therefore directly identifies the position associated with the cardinal number fifteen.
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