fatigue

From Wiktionary
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Pronunciation[change]

Noun[change]

Singular
fatigue

Plural
fatigues

  1. Fatigue is the extreme tiredness which is the result of having mental or physical exertion or illness.
  2. (engineering) Fatigue is the material failure, such as cracking or separation, caused by stress on the material.
    Mechanical failures due to fatigue have been the subject of engineering efforts for more than 150 years.