| NOUN | time | elapsed time | the time that elapses while some event is occurring |
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| Meaning | The time that elapses while some event is occurring. | |
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| Narrower | one-way light time, OWLT | The elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object |
| round-trip light time, RTLT | The elapsed time it takes for a signal to travel from Earth to a spacecraft (or other body) and back to the starting point | |
| Broader | time period, period of time, period | An amount of time |
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