"Deflation is the opposite of inflation. Therefore, under the...

"Deflation is the opposite of inflation. Therefore, under the usual contemporary definition of inflation, 'deflation' means a decrease in the general price level.[1] Alternatively, the term was used by the classical economists to refer to a decrease in the money supply and credit; some economists, including many Austrian school economists, still use the word in this sense. The two meanings are closely related, since a decrease in the money supply is likely to cause a decrease in the price level.

Deflation is considered a problem in a modern economy because of the potential of a deflationary spiral and its association with the Great Depression, although not all episodes of deflation correspond to periods of poor economic growth historically."
For those who strugle with the meaning..