Etymology
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Septuagint (n.)

"Greek version of the Old Testament," 1630s, earlier as the word for the translators collectively (1570s), from Late Latin septuaginta (interpretes) "the seventy (interpreters)," from Latin septuaginta "seventy" (translating Greek hebdomēkonta),  from septem "seven" (see seven) + -ginta "tens, ten times" (from PIE *dkm-ta-, from root *dekm- "ten").

So called in reference to the (incorrect) tradition that the translation was done 3c. B.C.E. by 70 or 72 Jewish scholars (in Middle English, the Seuenty turneres) from Palestine and completed in 70 or 72 days. The translation is believed now to have been carried out at different times by an undetermined number of Egyptian Jews. Often denoted by Roman numerals, LXX. Related: Septuagintal.

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Definitions of Septuagint

Septuagint (n.)
the oldest Greek version of the Old Testament; said to have been translated from the Hebrew by Jewish scholars at the request of Ptolemy II;
From wordnet.princeton.edu