The Collaborative International Dictionary of English v.0.48:
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,
I have served him from the hour of my nativity.
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.
2. (Fine Arts) (capitalized) 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 one's future destinies; a horoscope.
The Nativity, the birth or birthday of Christ; Christmas
To cast one's nativity or To calculate one's nativity
(Astrol.), to find out and represent the position of the
heavenly bodies at the time of one's birth.