Source : Webster's Revised Unabridged Dictionary (1913)

Fourscore \Four"score`\, a. [Four + core, n.]
   Four times twenty; eighty.

Fourscore \Four"score`\, n.
   The product of four times twenty; eighty units or objects.

Source : WordNet®

fourscore
     adj : being ten more than seventy [syn: {eighty}, {80}, {lxxx}]
     n : the cardinal number that is the product of ten and eight
         [syn: {eighty}, {80}, {LXXX}]