|Origin:||Januarius, from Janus ancient Roman god of doors, gates, and new beginnings|
Jan‧u‧a‧ry plural Januaries [uncountable and countable] written abbreviation Jan.
the first month of the year, between December and February
I haven't heard from him since last January.
She started working there in January.
on January 6th
Rosie's party was on January 6th.
on 6th January British English
He took office on 6th January 1999.
January 6 American English
The package arrived January 6.