出典:Wiktionary
出典:『Wiktionary』 (2026/02/24 22:38 UTC 版)
Inherited from 中期英語 sevententhe, seventethe, from 古期英語 seofontēoþa, equivalent to seventeen + -th.
English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.