The Collaborative International Dictionary of English v.0.48:
Jan \Jan\ (j[a^]n), n. [Ar.] (Moham. Myth.) One of an intermediate order between angels and men. [1913 Webster]WordNet (r) 3.0 (2006):
Jan n 1: the first month of the year; begins 10 days after the winter solstice [syn: January, Jan]