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 Chronophotography is defined as a set of photographs of a moving object, taken for the purpose of recording and exhibiting successive phases of motion. The term chronophotography was coined by French physiologist Ãtienne-Jules Marey to describe photographs of movement from which measurements could be taken and motion could be studied. It is derived from the Greek word ÏÏÏÎ½Î¿Ï chrÃ³nos (time) combined with photography.