1. The morning star; the planet Venus when she appears in the sky before sunrise: Victor's mother always enjoyed getting up early so that she could see Lucifer in the sky before daylight.
2. The rebel archangel whose fall from heaven was supposed to be referred to in Isaiah xiv. 12 (in the Old Testament Bible): Satan, the Devil was interpreted by some to be Lucifer.
3. Etymology: "light-bearing", "light-bringer", or "bringing light" from Latin lux, lucis, "light" + ferre, "to carry".

In Judeo-Christian and Islamic religions; he was the chief spirit of evil and the adversary of God; and a master of Hell.

Belief that Lucifer was the proper name of Satan began with its reference in the Bible to translate Greek Phosphoros, which translates Hebrew Helel ben Shahar in Isaiah xiv.12: "How art thou fallen from heaven, O Lucifer, son of the morning!" [King James Version]. The verse was interpreted by Christians as a reference to "Satan", because of the mention of a fall from Heaven.