from
The Collaborative International Dictionary of English v.0.48
hyperinflation \hyperinflation\ n.
an unusually rapid rate of monetary inflation, as when prices
rise more than 100 per cent per year.
Note: A famous example occurred in Germany after the first
World War, reaching its peak in the period 1923. When
the hyperinflation ended by 1924, the value of the mark
had decreased by more than one trillion times compared
to its value in 1914. Periods of lesser hyperinflation
have occurred in many other countries, as in Russia in
1994.
[PJC]