Source : Webster's Revised Unabridged Dictionary (1913)

Nativity \Na*tiv"i*ty\, n.; pl. {Nativies}. [F. nativit['e], L.
   nativitas. See {Native}, and cf. {Na["i]vet['E]}.]
   1. The coming into life or into the world; birth; also, the
      circumstances attending birth, as time, place, manner,
      etc. --Chaucer.

            I have served him from the hour of my nativity.
                                                  --Shak.

            Thou hast left . . . the land of thy nativity.
                                                  --Ruth ii. 11.

            These in their dark nativity the deep Shall yield
            us, pregnant with infernal flame.     --Milton.

   2. (Fine Arts) A picture representing or symbolizing the
      early infancy of Christ. The simplest form is the babe in
      a rude cradle, and the heads of an ox and an ass to
      express the stable in which he was born.

   3. (Astrol.) A representation of the positions of the
      heavenly bodies as the moment of one's birth, supposed to
      indicate his future destinies; a horoscope.

   {The Nativity}, the birth or birthday of Christ; Christmas
      day.

   {To}

   {cast, or calculate},

   {one's nativity} (Astrol.), to find out and represent the
      position of the heavenly bodies at the time of one's
      birth.

Source : WordNet®

nativity
     n 1: the event of being born; "they celebrated the birth of their
          first child" [syn: {birth}, {nascency}, {nascence}]
          [ant: {death}]
     2: the theological doctrine that Jesus Christ had no human
        father; Christians believe that Jesus's birth fulfilled
        Old Testament prophecies and was attended by miracles; the
        Nativity is celebrated at Christmas [syn: {Virgin Birth}]