re laxation time

noun Physics.

the time that it takes for an exponentially decaying quantity, as radioactive particles or transient electrical currents, to decrease to 36.8 percent of its initial value.

Origin:
1970–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To re laxation time

WordNet

relaxation time
noun
the time constant of an exponential return of a system to equilibrium after a disturbance

WordNet® 3.0, © 2006 by Princeton University.
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Re laxation time is always a great word to know.

So is flibbertigibbet. Does it mean:

a chattering or flighty, light-headed person.

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

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re laxation time

relaxation time