Definition of "serf"
noun:
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A partially free peasant of a low hereditary class, slavishly attached to the land owned by a feudal lord and required to perform labour, enjoying minimal legal or customary rights.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A similar agricultural labourer in 18th and 19th century Europe.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A worker unit.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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