Price-Deflation is what you are used to hearing about in Bitcoin. That term is used to describe the prices of goods/services as they decrease, because the value of Bitcoin goes up.
Price-Inflation is the opposite. When prices of goods/services increase because the value of Bitcoin goes down.
So, when dealing with Price-Inflation or Deflation, there is an inverse relationship of price and value, in regard to goods/services and Bitcoin.
Example: As the Bitcoin price goes from $10 to $20, the prices of goods/services goes down from 20BTC to 10BTC. As the Bitcoin price goes from $20 to $10, the prices of goods/services goes from 10BTC to 20BTC!
This works only if treated as a loose analogy or "what would happen if the economy ran on Bitcoin only and everything else was unchanged".
In fact, Bitcoin does not have any meaningful price inflation (or price deflation) since there are no prices that are actually set in BTC. I've yet to see a price even remotely sticky in BTC, everything is indexed to USD or other fiat. Sure, you could measure how much goods you could buy for your coins, but there is no added information in that.