... a person employed to work fewer than the standard daily or weekly hours of work established for a full-time employee of the same occupational group and level
... the prescribed thresholds for the size of the workforce shall be based on the average number of employees, including part-time employees, employed during the previous two years calculated according to national legislation and/or practice.
job sharing - dividing the work of one full-time employee between two or more part-time employees
The term 'part-time worker' refers to an employee whose normal hours of work, calculated on a weekly basis or on average over a period of employment of up to one year, are less than the normal hours of work of a comparable full-time worker.