JanuaryyoudaoicibaDictYouDict[January 词源字典]
January: [14] The ancient Romans had a god named Janus whose head had two faces, looking in opposite directions. He was the tutelary deity of doorways, and his festival month was at the beginning of the year, when he could look both backwards at the old year and forwards to the new one. This month was therefore called Jānuārius mensis ‘month of Janus’ – whence English January.
[January etymology, January origin, 英语词源]
January (n.)youdaoicibaDictYouDict
late 13c., Ieneuer, from Old North French Genever, Old French Jenvier (Modern French Janvier), attested from early 12c. in Anglo-French, from Latin Ianuarius (mensis) "(the month) of Janus," to whom the month was sacred as the beginning of the year (see Janus; cognates: Italian Gennaio, Provençal Genovier, Portuguese Janeiro). The form was gradually Latinized by c. 1400. Replaced Old English geola se æfterra "Later Yule." In Chaucer, a type-name for an old man.