What does Chiliad mean in the Bible?

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Webster's Dictionary - Chiliad
(n.) A thousand; the aggregate of a thousand things; especially, a period of a thousand years.

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Septuagint Chronology - The following is the reason which is given by Oriental writers; It being a very ancient tradition that Messiah was to come in the sixth Chiliad, because he was to come in the last days, (founded on a mystical application of the six days creation, ) the contrivance was to shorten the age of the world from about 5500 to 3760; and thence to prove that Jesus could not be the Messiah
Septuagint Chronology - The following is the reason which is given by the oriental writers: It being a very ancient tradition that Messiah was to come in the sixth Chiliad, because he was to come in the last days, founded on a mystical application of the six days of the creation, the contrivance was to shorten the age of the world from about 5500 to 3760; and thence to prove that Jesus could not be the Messiah