[ adverb ] by a factor of four
"the price of gasoline has increased fourfold over the past two years"
Used in print(Jack Kaplan, "The Health Machine Menace: Therapy by...)
For_example , the BBB has reported it was receiving four_times as many inquiries about quack devices and 10 times as_many complaints compared with two years ago .(J. F. Vedder, "Micrometeorites", in Francis S. J...)
Note that the mass threshold is four_times that of 1958_Alpha and that the flux is one_fifth as large .