Part-time means working fewer than the usual full hours. A part-time job, work part-time, part-time staff.
There is no fixed number that defines it, since part-time simply means fewer hours than a comparable full-time worker at the same employer. British law gives part-time staff the same rights pro rata.
1adjectivepart-timeWorking fewer than the usual full hours.
“She works part-time in a bookshop, just three mornings a week.”
part-time is a quality.
Part plus time, in use from the nineteenth century as regular working hours became standardised.
From part + time.
Etymology from Wiktionary, CC BY-SA
Practised in Work & Careers