Easton's Bible Dictionary
Nativity of Christ
The birth of our Lord took place at the time and place predicted by the prophets (Genesis 49:10; Isaiah 7:14; Jeremiah 31:15; Micah 5:2; Haggai 2:6-9; Dan. 9:24, 25). Joseph and Mary were providentially led to go up to Bethlehem at this period, and there Christ was born (Matthew 2:1, 6; Luke 2:1, 7). The exact year or month or day of his birth cannot, however, now be exactly ascertained. We know, however, that it took place in the "fulness of the time" (Galatians 4:4), i.e., at the fittest time in the world's history. Chronologists are now generally agreed that the year 4 before the Christian era was the year of Christ's nativity, and consequently that he was about four years old in the year 1 A.D.
Noah Webster's New International Dictionary of the English Language
1. (n.) The coming into life or into the world; birth; also, the circumstances attending birth, as time, place, manner, etc.
2. (n.) 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. (n.) A representation of the positions of the heavenly bodies as the moment of one's birth, supposed to indicate his future destinies; a horoscope.