Are we in deflation?

Did you notice that the price of gas is going down every day? Is this a good sign? To ordinary people like me, it's a good sign. After the sky-high price of gas 6 months ago, at least we could breathe now. If you go to department stores, you will notice clothing is cheaper now. Let's see if the price of food will go down too. I don't see any development yet. But I am kinda worried why the prices of goods went down during recession or economic crisis. Are we in deflation?