noun

• (now dated) Someone's birth; the place, time and circumstances of a birth.
  "1483, William Caxton, Prologue to The Golden Legend, The Holbein Society’s Fac-simile Reprints, London: The Holbein Society, 1878, […] me semeth to be a souerayn wele to Incyte & exhorte men & wymmen to kepe them from slouthe & ydlenesse & to lete to be vnderstonden to suche peple as been not lettered the natyuytees, lyues, the passyons, the myracles and the dethe of the holy saynts […]"
• (astrology) Someone's birth considered as a means of astrology; a horoscope associated with a person's birth.
  "You ſtarres that raignd at my natiuitie, / whoſe influence hath alotted death and hel, / Now draw vp Fauſtus like a foggy miſt, / Into the intrailes of yon labring cloude, / That when you vomite foorth into the ayre, / My limbes may iſſue from your ſmoaky mouthes, / So that my ſoule may but aſcend to heauen: […]"
• (also with capital initial) The birth of Jesus.
  "[…] towards the end of dinner […] there is an hymn sung, varied according to the invention of him that composeth it […] but the subject of it is (always) the praises of Adam and Noah and Abraham; whereof the former two peopled the world, and the last was the Father of the Faithful: concluding ever with a thanksgiving for the nativity of our Saviour, in whose birth the births of all are only blessed."
• (Christianity, also with capital initial) The festival celebrating the birth of Jesus, Christmas Day; the festival celebrating the birth of the Virgin Mary or the birth of Saint John the Baptist.
  "Be it therefore enacted by the authority of this present parliament, that the said statute of repeal, and every thing therein contained […] shall be void and of none effect, from, and after the feast of the Nativity of S. John Baptist, next coming."

name

• (Christianity) The birth of Jesus as described in the Gospels of Matthew and Luke.
• (by extension) Christmas.