Septuagint- A Latin word meaning "seventy" in reference to the seventy Jewish scholars who translated the Hebrew Scriptures into Greek. From the Latin phrase "versio septuaginta interpretum", meaning "translation of the seventy interpreters". The term most often applies to that Greek translation rather than the translators themselves. The translation occurred circa 300-250 BCE. Pronounced sep TOO uh jint.
Somtimes abbreviated LXX (Roman numerals for 70). See http://www.kalvesmaki.com/LXX/secondlit.htm for more information about the Septuagint.