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a decrease in the rate of inflation

Disinflation is a decrease in the rate of inflation – a slowdown in the rate of increase of the general price level of goods and services over a period of time.

a slowing of the rate of increase in prices

Basically, deflation is falling prices (or more accurately a decrease in the money supply that results in falling prices) while disinflation is a slowing of the rate of increase in prices.