出典:Wiktionary
出典:『Wiktionary』 (2026/01/08 19:19 UTC 版)
From Latin decennium, from decennis (“10-year”) + -ium (suffix forming abstract nouns), from deciēs (“ten times”) + annus (“year”) + -is (suffix forming compound adjectives). Equivalent to decennial + -ium.
decennium (plural decenniums or decennia)
When decennium is used in place of the more common decade, it is generally employed to avoid the connection of decade with the set spans of ten year calendar periods whose last digits run from 1 to 0 or 0 to 9.
decennium n (genitive decenniī or decennī); second declension
Second-declension noun (neuter).
| singular | plural | |
|---|---|---|
| nominative | decennium | decennia |
| genitive | decenniī decennī |
decenniōrum |
| dative | decenniō | decenniīs |
| accusative | decennium | decennia |
| ablative | decenniō | decenniīs |
| vocative | decennium | decennia |
名詞の変化形:
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