Definition of fourfold in US English:



  • 1Four times as great or as numerous.

    ‘there has been a fourfold increase in break-ins’
    • ‘Many of them are among the most threatened species on the planet, yet there has been a fourfold increase in hunting trophies being imported into the UK since 1998.’
    • ‘But data collected by federal health officials shows as much as a fourfold increase in the number of prescriptions written by physicians in some states from 1997 to 2001.’
    • ‘The company employs a staff of five in Bantry but expansion plans envisage a fourfold increase over the next three years.’
    • ‘The G5 will end this nonsense: in many tasks, there have been fourfold increases in integer and floating point performance.’
    • ‘Close to 10,000 people from the Indian subcontinent arrived in Britain on the basis of work permits last year, a fourfold increase since 1990.’
    • ‘Some waterfront areas like Canton, where there has been a fourfold increase in property values, are blossoming.’
    • ‘We brought it back in-house for production and there's been a fourfold increase in sales.’
    • ‘New Mexico and Arizona were hit with a nearly fourfold increase in acres burned.’
    • ‘The Commission on Child Abuse, due to start its hearings soon, received a fourfold increase in funding to €12m.’
    • ‘Also vital to the coming week is the fourfold increase in postal voting which means a chunk of voters placing crosses in boxes from this weekend.’
    • ‘The demand for good childcare is clearly there: in the first three months of the Clark government's new subsidy levels for childcare and out-of-school care, there has been almost a fourfold increase in subsidy grants.’
    • ‘In the past decade, in Scotland, there has been an almost 50% increase in oral cancer among under-45s, and in the last 40 years a fourfold increase in younger patients suffering from it.’
    • ‘There was a fourfold increase in the number of girls enrolled and the number of female teachers increased from 36 to 787.’
    • ‘Edinburgh Rugby claim an average of 3,500 spectators for games this season, a fourfold increase from the previous year when they were known as the Edinburgh Reivers.’
    • ‘After four years, women in the diabetes group had a fourfold increase in the risk of cognitive decline on the verbal fluency test compared with nondiabetic women.’
    • ‘This year it went up to £118 billion - a fourfold increase in two years!’
    • ‘By 2010, food production in the cerrado is expected to increase to 98 million tons, a fourfold increase over 1990.’
    • ‘Over the past four years there has been a fourfold increase in the suicide rate within this age group.’
    • ‘This represents a fourfold increase in investment spend in the British market since 2000.’
    • ‘Young adults with normal lung function who later develop chronic cough and phlegm have a fourfold higher risk of developing chronic obstructive pulmonary disease.’
    1. 1.1 Having four parts or elements.
      ‘fourfold symmetry’
      • ‘As indicated by the shaded areas in the figure, the cavity is connected to outside through two types of channels having threefold and fourfold symmetries.’
      • ‘The reformed Swiss drug policy implemented in the 1990s is characterized by a fourfold approach, including elements of prevention, law enforcement, therapy, and harm reduction.’
      • ‘For tetrameric structures, some interfacial side chains were manually adjusted before performing the energy minimization step with the constraint of fourfold symmetry.’
      • ‘This cavity is connected to outside through channels with threefold and fourfold symmetry that are thought to provide permeation pathways for iron ions and protons, essential for proper functioning of ferritin as an iron depository.’
      • ‘Briefly, an ensemble of 25 models was generated with fourfold symmetry restraints and with secondary structure restraints corresponding to secondary structure elements in KcsA.’
      • ‘In column 3 (Maximum symmetry, axes), the pairs of figures denote numbers and types of axes of symmetry: thus, for example, the tetragonal system has one fourfold symmetry axis and four twofold axes.’
      • ‘The cube has a fourfold symmetry, and is somewhat shiftable.’
      • ‘The subunits were constrained to have fourfold symmetry when the voltage-sensing domain was docked onto the pore-forming domain.’
      • ‘The right-hand symbol shows the inversion point along the fourfold inversion axis.’


  • By four times; to four times the number or amount.

    ‘the price of electricity rose fourfold’
    • ‘His target is to increase turnover fourfold, to hit the #12 million mark by 2003 and establish the company as a UK market leader through a series of acquisitions and partnerships.’
    • ‘The number of shooting victims treated in a Dublin hospital has increased almost fourfold in the last four years, according to new research.’
    • ‘Two years later that figure had increased fourfold, and the numbers continue to grow.’
    • ‘If the world economy continued to expand at 3 per cent annually, the output of goods and services would increase fourfold over the next half-century, reaching $172 trillion.’
    • ‘The corals have increased about fourfold where the fish grazing is still continuing, but there's been no recovery.’
    • ‘He said: ‘We've increased our business fourfold in the last three and a half years, through manufacturing and the growth in property investments.’’
    • ‘We have increased fourfold the amount of money that is being put into injury prevention strategies, but funding local councils through the corporation is not an appropriate use of the money.’
    • ‘When I saw Marshall's name drift into the picture, my skepticism increased fourfold.’
    • ‘The population of Jerusalem was swollen fourfold by visitors.’
    • ‘Several other museums across the country said visitor numbers had doubled since charges were abolished at the start of last month, with some saying numbers had increased fourfold.’
    • ‘The proof is in the eating - the uptake of meals has increased fourfold since we decided to go it alone.’
    • ‘In 2001 and 2002, Khodorkovsky's net worth increased fourfold.’
    • ‘For if the sides are doubled the surface is multiplied fourfold and the volume eightfold.’
    • ‘The much hailed zero-tolerance regime in Sweden has led to a fourfold increase in drug-related deaths since 1995, now resulting in the highest death rate per capita in the whole of Europe.’
    • ‘In Bangkok, the number of non-Thais checking in for treatment at the leading private hospital, Bumrungrad, has increased fourfold since 1996.’
    • ‘It is now thought that between 60 and 80 per cent of osteoporosis risk is genetic - if one parent had osteoporosis your risk more than doubles, if both were affected your risk increases fourfold.’
    • ‘Yesterday's figures showed melanoma rates for Scots aged 15 to 24 had increased fourfold, from 9.8 cases per million people in the late 1970s to 40.3 per million in the late 1990s.’
    • ‘Multi-million pound plans would see the output from the site increase fourfold, or enough electricity to supply around 22,000 homes.’
    • ‘On the surface things appeared positive for the company: the theatre's financial turnover increased fourfold between 1999 and 2003 and so too did its audience, growing from 1,500 to almost 9,000.’
    • ‘Perhaps the latter could use the loose change from its fourfold increase in turnover.’