New Year's Day \New" Year's` Day"\ the first day of a calendar year; the first day of January. Often colloquially abbreviated to New year's or new year. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

New Year

Source: WordNet (r) 2.0
 

New Year's Day \New" Year's` Day"\ the first day of a calendar year; the first day of January. Often colloquially abbreviated to New year's or new year.

Source: Webster's Revised Unabridged Dictionary (1913)