The meaning of Seventy weeks in the Bible
(From Easton's Bible Dictionary)

a prophetic period mentioned in Daniel 9:24, and usually interpreted on the "year-day" theory, i.e., reckoning each day for a year. This period will thus represent 490 years. This is regarded as the period which would elapse till the time of the coming of the Messiah, dating "from the going forth of the commandment to restore and rebuild Jerusalem" i.e., from the close of the Captivity.

See more on the meaning of Seventy Weeks in the Bible:
Seventy Weeks {International Standard Bible Encyclopedia}

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