The Collaborative International Dictionary of English v.0.48:

Fourscore \Four"score`\ (f[=o]r"sk[=o]r`), a. [Four + core, n.]
   Four times twenty; eighty.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fourscore \Four"score`\, n.
   The product of four times twenty; eighty units or objects.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fourscore
    adj 1: being ten more than seventy [syn: eighty, 80, lxxx,
           fourscore]
    n 1: the cardinal number that is the product of ten and eight
         [syn: eighty, 80, LXXX, fourscore]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "fourscore":
   L, Sexagesima, boxcar, boxcars, dozen, duodecimo, eighty, eleven,
   fifteen, fifty, five and twenty, fortnight, forty, four and twenty,
   fourscore and ten, fourteen, half a hundred, long dozen, ninety,
   nonagenarian, octogenarian, quindecennial, quindecim, quindecima,
   quindene, score, septuagenarian, seventy, sexagenarian, sexagenary,
   sexagesimo-quarto, sixteen, sixteenmo, sixty, sixty-four,
   sixty-fourmo, teens, thirteen, thirty-two, thirty-twomo,
   threescore, threescore and ten, twelve, twelvemo, twenty,
   twenty-five, twenty-four, twenty-fourmo, two dozen, two weeks,
   twoscore