also: ひとや · ひとよ
noun, adverb
one night; all night; overnight
Refers to a single night or the duration of one night. Can be used as a noun or adverbially.
彼は一夜でその本を読み終えた。
He finished reading the book in one night.
一夜明けると
When morning came, snow had piled up overnight.
Rare reading; いちや is overwhelmingly more common.
Compound of 一 (いち, 'one') and 夜 (や, 'night'). The reading いちや is the standard on'yomi combination.