■ cardinal number ( plural seventies ) the number equivalent to the product of seven and ten; ten less than eighty; 70. (Roman numeral: lxx or LXX .)
Derivatives
seventieth ordinal number .
~fold adjective & adverb
Origin
OE hundseofontig , from hund- (of uncertain origin) + seofon 'seven' + -tig (see -ty 2 ).