Definition of fourfold in English:

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Pronunciation: /ˈfôrˌfōld/


1Four times as great or as numerous: there has been a fourfold increase in break-ins
More example sentences
  • Over the past four years there has been a fourfold increase in the suicide rate within this age group.
  • 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.
  • 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.
1.1Having four parts or elements: fourfold symmetry
More example sentences
  • 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 reformed Swiss drug policy implemented in the 1990s is characterized by a fourfold approach, including elements of prevention, law enforcement, therapy, and harm reduction.
  • 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.


By four times; to four times the number or amount: the price of electricity rose fourfold
More example sentences
  • 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.
  • Multi-million pound plans would see the output from the site increase fourfold, or enough electricity to supply around 22,000 homes.
  • The population of Jerusalem was swollen fourfold by visitors.

For editors and proofreaders

Syllabification: four·fold

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