NOCTURNAL a. 3 definitions
Of, pertaining to, done or occuring in, the night; as, nocturnal darkness, cries, expedition, etc.; -- opposed to Ant: diurnal. Dryden.
SATURNALIA n. 2 definitions
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.