3 definitions found From WordNet (r) 2.0 [wn]: forty adjective: being ten more than thirty [syn: {40}, {xl}, {twoscore}] noun: the cardinal number that is the product of ten and four [syn: {40}, {XL}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Forty \For"ty\, noun; pl. {Forties} (-t[i^]z). 1. The sum of four tens; forty units or objects. 2. A symbol expressing forty units; as, 40, or xl. From The Collaborative International Dictionary of English v.0.44 [gcide]: Forty \For"ty\ (f[^o]r"t[y^]), adjective [OE. forti, fourti, fowerti, AS. fe['o]wertig; fe['o]wer four + suff. -tig ten; akin to OS. fiwartig, fiartig, D. veertig, G. vierzig, Icel. fj["o]rut[=i]u, Sw. fyratio, Dan. fyrretyve, Goth. fidw[=o]r tigjus. See {Four}, and {Ten}, and cf. {Fourteen}.] Four times ten; thirty-nine and one more.

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