And the term "general" is also defined. It can mean general within a nation. It can mean general worldwide. It can mean general on a continent. It can mean general in a state. It can mean general in an economic sector (food, computers, cars, clothes, houses, etc.). Etc.
So, we have to use a different word to describe non-general price declines? If so, what word would you suggest? http://www.google.com/search?q=deflation+prices+computers
Why would it be OK to use the word "temperature" in different contexts, but not the word "deflation"? What about the word "pressure"? Should we use a different word for tire pressure, because of the fact that "pressure" is also used in other contexts?