temporary employment; temp work
Refers to short-term or non-permanent employment arrangements, often contrasted with regular full-time positions.
He works at the factory on a temporary basis.
The increase in temporary employment has become a social issue.
正社員 refers to a regular, permanent employee, while 一時雇用 is temporary or non-regular employment.
派遣 (temporary staffing) often involves a staffing agency, whereas 一時雇用 can be direct temporary hiring.
Compound of 一時 (temporary) and 雇用 (employment).