four times ten
Origin of fortyMiddle English fourti ; from Old English feowertig, akin to German vierzig, Gothic fidwor tigjus: see four and amp; -ty
the cardinal number between thirty-nine and forty-one; 40; XL
the numbers or years, as of a century, from forty through forty-nine
- The cardinal number equal to 4 × 10.
- fortiesa. A decade or the numbers from 40 to 49: They stopped smoking in their forties. At night the temperature fell into the forties.b. often Forties The decade from 40 to 49 in a century.
Origin of fortyMiddle English, from Old English f&emacron;owertig; see kwetwer- in Indo-European roots.
- Ordinal: fortieth.
- "Fourty" is considered incorrect. The spelling "forty" relates to some of the other numbers representing tens. Examples: twenty rather than twoty, thirty rather than threety, and fifty rather than fivety.