A situation in which prices in an economy don't change much over time.  Price stability would mean that an economy would not experience inflation or deflation.  It is not common for an economy to have price stability.
Related information about price stability:
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 Definition of price stability: A situation in which prices in an economy don't   change much over time. Price stability would mean that an economy would not ...
 
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 The objective of price stability refers to the general level of prices in the economy.   It implies avoiding both prolonged inflation and deflation. Price stability ...
 
- ECB: Definition of price stability
 While the Treaty clearly establishes the primary objective of the ECB, it does not   give a precise definition of what is meant by price stability. The ECB's Governing ...
 
- price stability: why is it important for you? - European Central Bank
 overview of the reasons why price stability is so important in ensuring that   prosperity is sustained and of ... price stability, how it can best be achieved, and   how ...
 
- Price Stability News - Bloomberg
 Breaking news about Price Stability. Find the latest articles, videos, photos and   blogs about Price Stability.
 
- Is price stability enough?
 Abstract: No one in the industrial countries should now question the substantial   economic benefits associated with reducing inflation from earlier, high levels.
 
- CFEPS - Center for Full Employment and Price Stability
 The Center for Full Employment and Price Stability is a non-partisan, non-profit   policy institute at the University of Missouri - Kansas City dedicated to promoting ...
 
- The Price Stability Trap - NYTimes.com
 Aug 12, 2010 ... The Price Stability Trap. There's an important new paper from the IMF about   inflation in the face of Prolonged Large Output Gaps — yes, PLOGs ...