Etymology
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LXX (n.)

Roman numerals for "seventy," hence "Septuagint" (q.v.).

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Definitions of LXX
1
lxx (n.)
the cardinal number that is the product of ten and seven;
Synonyms: seventy / "
2
lxx (adj.)
being ten more than sixty;
Synonyms: seventy / "
From wordnet.princeton.edu