forty Meaning, Definition & Usage

  1. noun the cardinal number that is the product of ten and four
    XL; 40.
  2. adjective satellite being ten more than thirty
    twoscore; xl; 40.

WordNet

For"ty adjective
Etymology
OE. forti, fourti, fowerty, AS. feówertig; feówer four + suff. -tig ten; akin to OS. fiwartig, fiartig, D. veertig, G. vierzig, Icel. fjörutiu, Sw. fyratio, Dan. fyrretyve, Goth. fidwr tigjus. See Four, and Ten, and cf. Fourteen.
Definitions
  1. Four times ten; thirtynine and one more.
For"ty noun
Wordforms
plural Forties
Definitions
  1. The sum of four tens; forty units or objects.
  2. A symbol expressing forty units; as, 40, or xl.

Webster 1913