\Sep"tu*a*gint\, n. [From L. septuaginta seventy.]
A Greek version of the Old Testament; -- so called because it
was believed to be the work of seventy (or rather of
seventy-two) translators.
Note: The causes which produced it [the Septuagint], the
      number and names of the translators, the times at which
      different portions were translated, are all uncertain.
      The only point in which all agree is that Alexandria
      was the birthplace of the version. On one other point
      there is a near agreement, namely, as to time, that the
      version was made, or at least commenced, in the time of
      the early Ptolemies, in the first half of the third
      century b.c. --Dr. W. Smith (Bib. Dict.)
{Septuagint chronology}, the chronology founded upon the
   dates of the Septuagint, which makes 1500 years more from
   the creation to Abraham than the Hebrew Bible.