Rare term for midsummer. In modern Japanese, 真夏 (まなつ) is the standard word.
Archaic term for China. The cross-reference to 中華 suggests this is an old alternative name.
See also: 中華
capital city
Archaic term for a capital city. Extremely rare; not used in modern Japanese.
In old waka poetry, 中夏 can be read ちゅうか and used to mean midsummer.
In Edo-period documents, examples can be found where 中夏 is read ちゅうか and refers to China.
Using 中夏 to mean capital is a very old usage and is hardly ever seen today.