出典:Wiktionary
出典:『Wiktionary』 (2026/04/21 03:40 UTC 版)
UI (countable and uncountable, plural UIs)
UI
出典:『Wiktionary』 (2024/12/08 01:26 UTC 版)
As the nominative and vocative plural ending for the second declension suffix -uus, unknown, but displaced Proto-Italic *-wosjo, genitive singular of *-wos. As the dative singular for fourth declension nouns, from Proto-Italic *-owei, dative singular of *-us.
-uī
This ending is no longer used for neuter nouns in the fourth declension, being ousted by -ū, which now occupies all endings in the singular of neuter nouns except the genitive singular, which has -ūs. The fourth declension is the only declension group to have different dative singular forms between neuter nouns and non-neuter nouns.
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