n. & adj.
n. (pl. -ies) 1 the product of seven and ten. 2 a symbol for this (70, lxx, LXX). 3 (in pl.) the numbers from 70 to 79, esp. the years of a century or of a person's life.
adj. that amount to seventy. seventy-first, -second , etc. the ordinal numbers between seventieth and eightieth. seventy-one, -two , etc. the cardinal numbers between seventy and eighty. seventieth adj. & n. seventyfold adj. & adv.
[ OE -seofontig ]