January definition
Origin of january
- Middle English Januarie, Jenever from Old North French Jenever from Latin Iānuārius (mēnsis) (month) of Janus from Iānus Janus ei- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- Re-Latinized from Middle English Ieneuer, from Anglo-Norman genever, from Latin iānuārius (“(month) of Janus”), perhaps from Proto-Indo-European base *ei-, "to go".
From Wiktionary