counter
counter for nights of a stay
Used after a number to count how many nights one stays, e.g. at a hotel or inn. Often used with 一泊, 二泊, etc.
京都に二泊する予定です。
I plan to stay two nights in Kyoto.
一泊二日の旅行に行った。
I went on a one-night, two-day trip.
noun
overnight stay; lodging
Rare standalone noun meaning an overnight stay or lodging. In modern Japanese, 宿泊 or 滞在 are much more common.
この町での泊は初めてです。
This is my first overnight stay in this town.