'Jan' definitions:

Definition of 'Jan'

From: WordNet
noun
The first month of the year; begins 10 days after the winter solstice [syn: January, Jan]

Definition of 'Jan'

From: GCIDE
  • Jan \Jan\ (j[a^]n), n. [Ar.] (Moham. Myth.) One of an intermediate order between angels and men. [1913 Webster]