The business cycle or economic cycle is the downward and upward movement of gross domestic product around its long-term growth trend.
Gross domestic product is a monetary measure of the market value of all final goods and services produced in a period.
The Business Cycle by Jason Welker
The length of a business cycle is the period of time containing a single boom and contraction in sequence.
Macro 2.7- Business Cycle Unit Summary by ACDCLeadership
These fluctuations typically involve shifts over time between periods of relatively rapid economic growth, and periods of relative stagnation or decline.
Business cycles are usually measured by considering the growth rate of real gross domestic product.
Despite the often-applied term cycles, these fluctuations in economic activity do not exhibit uniform or predictable periodicity.
The common or popular usage boom-and-bust cycle refers to fluctuations in which the expansion is rapid and the contraction severe.