for‧ty/ˈfɔːti $ ˈfɔːrti/ number [Language : Old English; Origin : feowertig, from feower 'four'] 1. the number 40
2. the forties (also the '40s, the 1940s) [PLURAL]the years from 1940 to 1949: ▪ The place was built as a casino in the forties. the early/mid/late forties ▪ He spent several years in Paris in the late forties.
3. be in your forties to be aged between 40 and 49 early/mid/late forties ▪ The woman was probably in her mid forties.
4. in the forties if the temperature is in the forties, it is between 40 degrees and 49 degrees in the low/mid/high forties ▪ The temperature was up in the high forties.
—fortieth adjective: ▪ her fortieth birthday
number COLLOCATIONS FROM OTHER ENTRIES forty winks ▪ I felt a lot better after I had forty winks. PHRASES FROM OTHER ENTRIES be the wrong side of thirty/forty etc be thirty-something/forty-something etc