You must be one of those who use the words inflation and deflation in all sorts of arbitrary ways as Keynesians do, to mean whatever they have in mind at the moment. Inflation is the increase in the money supply. Prices rise unevenly with wages and salaries rising last of all. Some prices even fall as others rise more, wages typically falling in the early parts of an inflation as business try to compensate for their increased costs and decreased market by cutting wages.
Why do you speak of the price of groceries if you believe that inflation is unrelated to prices?