The Tribulation: The seven years of calamities described in the Book of Revelation.

Armageddon: The battle in which Jesus defeats the Antichrist.

The Millennium: Christ’s thousand-year rule on earth.

Premillennialism: The belief that Christ will return before the Millennium to lead his armies at Armageddon.

Pretribulationalism: The premillennialist doctrine, popularized by 19th-century British evangelist John Darby, that Jesus would Rapture the faithful before the Tribulation.

Evangelicals: Christians who say they have a personal relationship with Jesus Christ.

Fundamentalists: Christians who believe the Bible is the literal, inerrant word of God.