(n.) a worker who is employed for a particular period of the year, such as harvest, or Christmas (https://www.collinsdictionary.com/dictionary/english/seasonal-worker) § a third-country national who retains his or her principal place of residence in a third country and stays legally and temporarily in the territory of a Member State to carry out an activity dependent on the passing of the seasons, under one or more fixed-term work contracts concluded directly between that third-country national and the employer established in that Member State. (https://www.eurofound.europa.eu/observatories/eurwork/industrial-relations-dictionary/seasonal-worker).