—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.
Phrases and idioms:
seventy-first, -second , etc. the ordinal numbers between seventieth and eightieth. seventy-one, -two , etc. the cardinal numbers between seventy and eighty.
Derivatives:
seventieth adj. & n. seventyfold adj. & adv.
Etymology: OE -seofontig
Useful english dictionary. 2012.