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elapsed time - the time that elapses while some event is occurring. 1  period, period of time, time period - an amount of time; a time period of 30 years; hastened the period of time of his recovery; Picasso's blue period. one-way light time, OWLT - the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object.
The period elapsing between the application of a stimulus and the obvious response, such as the contraction of a muscle. 2. The interval between exposure to an infectious organism or a carcinogen and the clinical appearance of disease. Also called incubation period.