In the United States the unofficial beginning and ending dates of national economic expansions have been defined by an American private nonprofit research organization known as the National Bureau of Economic Research (NBER).he NBER defines an expansion as a period when economic activity rises substantially, spreads across the economy, and typically lasts for several years. During the 19th century, the United States experienced frequent boom and bust cycles.
chronologize definition: the entire process of setting up order in events based on the time occurrence for the occasions.; To arrange in historic order, as events with their dates.; establish the orderâ¦
Definition. A chronograph is a watch with timekeeping capability as well as the ability to function as a stopwatch. A chronograph can be equipped with as few as one or as many as four sub-dials, depending upon the precision and design of the watch. chronograph is any watch with a separate stopwatch feature, and its precision can vary; but chronographs tend to be very precise, as they are usually offered on high-end Swiss timepieces. A chronometer, however, is an officially certified chronograph whose precision has been tested.