One source of complexity in economic discussion is the ambiguity of the term "inflation." The usual definition is that this is the rate of growth of a price index of consumer goods (such as the CPI). However, economists quite often distinguish sustained rises in the price index versus one-time shocks. Unfortunately, it is difficult to determine whether a rise in prices is going to be sustained. For this reason, it is useful to avoid discussing generic inflation, and use more precise terminology...."Inflation" is one of those weasel words.
Primer: Inflation Versus Rising Prices