plural seventies
Definition of seventy
1 : a number equal to seven times 10 — see Table of Numbers
2 seventies plural : the numbers 70 to 79 specifically : the years 70 to 79 in a lifetime or century
3 capitalized : a Mormon elder ordained for missionary work under the apostles
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Time Traveler for seventy
The first known use of seventy was in the 13th century
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