Etymology
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seventy (adj., n.)

"seven times ten; 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 Saxon sibuntig, Old Frisian soventich, Middle Dutch seventich, Old High German sibunzug, Old Norse sjautugr.

Seventy-eight (78) "gramophone record played at a speed of seventy-eight revolutions per minute," which was the standard until the introduction of long-play (see LP) in 1948; the use of seventy-eight to distinguish the old discs is by 1951.

updated on July 04, 2022

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Definitions of seventy from WordNet
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, not affiliated with etymonline.