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The Collaborative International Dictionary of English v.0.48 (gcide)

January \Jan"u*a*ry\, n. [L. Januarius, fr. Janus an old Latin
deity, the god of the sun and the year, to whom the month of
January was sacred; cf. janua a door, Skr. y[=a] to go.]
The first month of the year, containing thirty-one days.
[1913 Webster]

Note: Before the adoption of New Style, the commencement of
the year was usually reckoned from March 25.
[1913 Webster]