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n. pl. for·ties
1. The cardinal number equal to 4 × 10.
2. forties
a. 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.

[Middle English, from Old English fēowertig; see kwetwer- in Indo-European roots.]

for′ty adj. & pron.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.forties - the time of life between 40 and 50forties - the time of life between 40 and 50  
time of life - a period of time during which a person is normally in a particular life state
adulthood, maturity - the period of time in your life after your physical growth has stopped and you are fully developed
2.forties - the decade from 1940 to 1949
decade, decennary, decennium - a period of 10 years
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
الأربعينياتدرجات الحرارَه بين 40 و 50في الأربعينيات من العُمْر
čtyřicátá létamezi čtyřiceti a padesáti stupnipo čtyřicítce
negyvenesnegyvenes évek
fimmti áratugurinnfimmtugsaldurmilli fjörutíu og fimmtíu
po štyridsiatkeštyridsiate roky
štirideseta leta
40-49 arası40-49 derecekırk yaşlarıkırklıkırklı yıllar


(ˈfoːti) noun
1. the number or figure 40.
2. the age of 40.
1. 40 in number.
2. aged 40.
ˈforties noun plural
1. the period of time between one's fortieth and fiftieth birthdays.
2. the range of temperatures between forty and fifty degrees.
3. the period of time between the fortieth and fiftieth years of a century.
ˈfortieth noun
1. one of forty equal parts.
2. (also adjective) the last of forty (people, things etc); the next after the thirty-ninth.
having forty (of something). a forty-page index.
ˈforty-year-old noun, adjective
(a person or animal) that is forty years old.
forty winks
a short sleep. He always has forty winks after dinner.

forty (not fourty).
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
References in classic literature ?
As we deep- water men always reckoned, he made one year in three fairly lively for anybody having business upon the Atlantic or down there along the "forties" of the Southern Ocean.
The North Sea is home to the dated Brent benchmark, which is underpinned by Forties crude and three other grades.
I met my beautiful Lesley Just over a year ago Until that magic moment My life was very low We are both in our middle forties Enjoying life to the full Life does begin at forty And it certainly isn't dull We got engaged at Christmas While on holiday in the sun Amidst a crowd of people Who were all enjoying the fun Like every loving couple We have our ups and downs Laughing, smiling, giggling Very seldom any frowns So life does begin at forty It's true in what they say The 23rd of February Is a very special day by A reader, Anfield
Refiner Thai Oil has bought North Sea Forties crude for the first time to reduce oil feedstock costs after prices for Middle East and Asia-Pacific supply surged, sources with knowledge of the matter said.
North Sea crude is vital for global oil markets because more than half of the world's international oil trade is priced against the dated Brent benchmark, consisting of four UK and Norwegian North Sea crudes with Britain's Forties the most important.
An unexploded World War II mine, which had been lying next to the key Forties crude oil pipeline operated by BP PLC in the North Sea, was removed and towed to a safe area for disposal.
The differential of North Sea Forties crude soared to a two-year high Tuesday, a level last seen in the oil bull run of early 2008.
Apache Corporation (NYSE: APA) (Nasdaq: APA), a US-based oil and gas production company with operations in UK, USA, Canada, and Egypt, has declared commencement of production from the Forties Charlie 6-3 well.
The survey paints a picture of women in their forties who throw caution to the wind when it comes to contraception.
"It is a well-kept secret, but my little corner of Brooklyn was a mecca for jazz during the forties and fifties," she says.
The vice president who manages the economy is a humble man in his forties, a medical doctor known for patiently explaining the logic of government economic policy on TV and radio.