also: はんじつ
half a day; half day
Refers to a period of roughly half a day, either as a noun or adverbially. The reading はんにち is standard; はんじつ is a rarer, more formal variant.
I spent half a day cleaning.
I took a half-day off.
This task takes half a day.
I took a half-day off today and went to the hospital.
I finished writing the report in half a day.
I spent a whole half-day cleaning the garden.