E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Millennium
means simply a thousand years. (Latin, mille annus.) In Rev. XX. 2 it is said that an angel bound Satan a thousand years, and in verse 4 we are told of certain martyrs who will come to life again, and reign with Christ a thousand years. This, says St. John, is the first resurrection; and this is what is meant by the millennium.