Definition of January noun from the Oxford Advanced Learner's Dictionary

  

January

 noun
noun
BrE BrE//ˈdʒænjuəri//
 
; NAmE NAmE//ˈdʒænjueri//
 
[uncountable, countable](abbreviation Jan.)
 
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the 1st month of the year, between December and February. To see how January is used, look at the examples at April. Word Origin Old English, from Latin Januarius (mensis) ‘(month) of Janus’, the Roman god who presided over doors and beginnings.
See the Oxford Advanced American Dictionary entry: January