Definition of: fatigue

(fə·tēg′) noun
1. Exhaustion of strength by toil; weariness.
2. Wearing toil.
3. Physiol. a A condition of lessened activity of an organism or any of its parts, resulting from prolonged exertion. b A diminished susceptibility to stimulation of the central nervous system, affecting primarily the junction between nerve and muscle fibers.
4. Metall. The failure of metals under prolonged or repeated stress, characterized by local deformation of structure.
5. Fatigue duty.
6. plural Strong, durable clothes worn on fatigue duty.
—v.t. & v.i. ·tigued, ·ti·guing To weary; tire out. [<F <fatiguer tire <L fatigare]