Extreme tiredness resulting from mental or physical exertion or illness. After the marathon, she experienced severe fatigue and needed to rest for several days.
Weakness in materials, especially metal, caused by repeated variations of stress. The engineer examined the bridge for signs of metal fatigue to ensure its safety.
Hard or menial work, especially military labor or chores performed by soldiers. The recruits were put on fatigue duty to clean the barracks.
Loose clothing, especially the work uniform worn by military personnel; fatigues. He changed into his fatigues before reporting to the motor pool.