c.1200, from Old French nativité "birth" (12c.), from Late Latin nativitatem (nominative nativitas) "birth," from Latin nativus "born, native" (see native (adj.)). Late Old English had nativiteð, from earlier Old French nativited.
The birth of Jesus, described in two of the Gospels (Matthew and Luke). When Jesus' parents, Mary and Joseph, traveled from Nazareth to Bethlehem to be counted in a government census, they found that there was no room for them in the local inn. Mary gave birth to Jesus in a common stable and laid him in a manger (a feeding trough for livestock). Christians believe that Jesus' birth fulfilled many Old Testament prophecies and was attended by miraculous events, such as a star above Bethlehem that drew local shepherds as well as the Wise Men, or Magi, from a distant land.
Note: The Nativity is celebrated at Christmas. We date our present historical era from the birth of Jesus, referring to the years before his birth as b.c. (before Christ) and the years after his birth as a.d. (anno Domini, a Latin phrase meaning “in the year of the Lord”).