Word Origin & History
"Greek version of the Old Testament," 1633, from L.L. septuaginta interpretes "seventy interpreters," from L. septuaginta "seventy," from septem "seven" + -ginta "tens." So called in allusion to the (false) tradition that the translation was done 3c. B.C.E. by 70 or 72 Jewish scholars from Palestine
and completed in 70 or 72 days. Often denoted by Roman numerals, LXX. The translation is believed now to have been carried out at different times by Egyptian Jews.