Source : Webster's Revised Unabridged Dictionary (1913)

Seventy \Sev"en*ty\, a. [AS. hund-seofontig. See {Seven}, and
   {Ten}, and cf. {Seventeen}, {Sixty}.]
   Seven times ten; one more than sixty-nine.

Seventy \Sev"en*ty\, n.; pl. {Seventies}.
   1. The sum of seven times ten; seventy units or objects.

   2. A symbol representing seventy units, as 70, or lxx.

   {The Seventy}, the translators of the Greek version of the
      Old Testament called the Septuagint. See {Septuagint}.

Source : WordNet®

seventy
     adj : being ten more than sixty [syn: {70}, {lxx}]

seventy
     n : the cardinal number that is the product of ten and seven
         [syn: {70}, {LXX}]