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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.
When time passes by, you say it elapses. Four years elapse while you are in high school. Nine months elapse while you are in the womb. If two weeks have elapsed between your tennis lessons, there has been a two-week lapse between sessions. The word elapse comes from the Latin word elabi which means to slip away.. Time is one of those things that really does tend to slip away, unless you're sitting through a lecture on the nature of time.