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Question for:

What five-letter word describes the following: a unit of time proposed by Gilbert Newton Lewis in 1926 that was equal to the time it takes light to travel one centimeter in a vacuum (approximately 33.3564 picoseconds), the period of an alternating current power cycle (1/60 or 1/50 of a second in most mains power supplies) and, as defined by Edward R. Harrison, the time it takes for light to travel one fermi.

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