What term is used to describe an erratic short-run fluctuation in economic activity around the long-run trend?

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A business cycle is a term used to describe the short-run fluctuation in economic activity around the long-run trend. This fluctuation includes periods of economic growth (boom) and economic contraction (recession), which are irregular and unpredictable in nature. Economic depression is a severe and prolonged economic downturn that lasts for many years, whereas diminishing returns refer to a situation where the marginal product of an input decreases as more units of the input are added.

What Term Is Used to Describe an Erratic Short-Run Fluctuation