Saturnalia n. pl. : The festival of Saturn, celebrated in December, originally during one day, but afterward during seven days, as a period of unrestrained license and merriment for all classes, extending even to the slaves.

Saturnalia n. pl. : Hence: A period or occasion of general license, in which the passions or vices have riotous indulgence.

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Taxonomy
Saturnalia, slaves, celebrations, Christmas, free encyclopedia, temple of Saturn, Saturn, holiday, the rest, dedication, Romans, Roman festivals, reversal, Rome, the masters, slaves and masters, sacrifices, statue.

Defination from the web:
Saturnalia (disambiguation) ... Saturnalia is the feast with which the Romans commemorated the dedication of the temple of the god Saturn, which was on 17 December. ... making and giving of small presents (saturnalia et sigillaricia) and a special market ...