the first month of the year, containing 31 days. Abbreviation: Jan.
Origin: before 1000;Middle English < Latin, noun use of Jānuārius, equivalent to Jānu(s) Janus + -ārius-ary; replacing Middle EnglishGenever, Jeniver < Anglo-French,Old FrenchGenever, Jenever < Latin, as above; replacing Old EnglishJanuarius < Latin
late 13c., Ieneuer, from O.N.Fr. Genever (Fr. Janvier), attested from early 12c. in Anglo-Fr., from L. Januarius (mensis) "(the month) of Janus," to whom the month was sacred as the beginning of the year (see Janus; cf. It. Gennajo, Prov. Genovier, Port. Janeiro). The form
was gradually Latinized by c.1400. Replaced O.E. geola se æfterra "Later Yule."