Time

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Definition:
The designation of an instant on a selected time scale, used in the sense of time of day; or the interval between two events or the duration of an event, used in the sense of time interval. NIST
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Glossary: Time & FrequencyThe Time and Frequency Division, part of NIST's Physics Laboratory, maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology.
U.S. Naval Observatory Time Service DepartmentThe Official Source of Time for the Department of Defense (DoD) and the Global Positioning System (GPS), and a Standard of Time for the United States
Wikipedia: Time


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