Easton's Bible Dictionary

Seventy weeks - a prophetic period mentioned in Dan. 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.