2 definitions found From WordNet (r) 2.0 [wn]: Jan noun: the first month of the year; begins 10 days after the winter solstice [syn: {January}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Jan \Jan\ (j[a^]n), noun [Ar.] (Moham. Myth.) One of an intermediate order between angels and men.

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