'January' definitions:

Definition of 'January'

From: WordNet
noun
The first month of the year; begins 10 days after the winter solstice [syn: January, Jan]

Definition of 'January'

From: 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]