noun, noun which may take the genitive case particle 'no'
tenth
Ordinal number meaning 'tenth'. Used as a noun or with の to modify another noun.
彼は第十回の大会で優勝した。
He won the championship at the tenth tournament.
第十条には重要な規定が書かれている。
Important provisions are written in Article 10.
Also means 'tenth', but is more colloquial and used for ordering items in a sequence (e.g., 十番目の選手). 第十 is more formal and often used in titles, article numbers, or numbered lists.
Compound of prefix 第 (ordinal marker) and 十 (ten).