Etymology
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seventy (adj., n.)

"1 more than sixty-nine; the number which is one more than sixty-nine; a symbol representing this number;" Old English (hund)seofontig, from seofon (see seven) + -tig (see -ty (1)). Similar formation in Old Frisian soventich, Middle Dutch seventich, Old Norse sjau tiger.

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