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From The Collaborative International Dictionary of English v.0.48:
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]