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relaxation time

noun, Physics.
1.
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 of relaxation time
1970-1975
First recorded in 1970-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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