Englishfor English speakers
fatigue
Noun
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Fatigue is the extreme tiredness which is the result of having mental or physical exertion or illness.
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Fatigue is the material failure, such as cracking or separation, caused by stress on the material.
failures due to fatigue have been the subject of engineering efforts for more than 150 years.
indicator
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noun
(= index)
a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
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noun
a signal for attracting attention
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noun
a device for showing the operating condition of some system
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noun
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction