MoneySupply-Inflation is when the value of Bitcoin decreases when the total supply of Bitcoin increases. In our current state, this is at a generation rate of 25 BTC every 10 minutes.

MoneySupply-Deflation will essentially never occur. It is when the value of Bitcoin increases when the total supply of Bitcoin decreases. This may happen, say, when someone loses their private key and all the BTC associated with it are lost. This effectively "makes the rest of us richer". That being said, there is a SET DECREASE in the generation rate of BTC, so you have sort of a "deflationary effect" in the value, as long as more exchange occurs for BTC at a rate which is faster than that set generation rate.