n.
    - extreme tiredness resulting from mental or physical exertion or illness. 
▸
[
with modifier]
 a lessening in one's response to or enthusiasm for something, caused by overexposure:
 election fatigue.
 - weakness in metal or other materials caused by repeated variations of stress.
 - 
(fatigues)
 menial non-military tasks performed by a soldier. 
▸a group of soldiers ordered to do such a duty.
 - 
(fatigues)
 loose-fitting clothing of a sort worn by soldiers.
 
v.
 (fatigues, fatiguing, fatigued)
 cause to suffer fatigue.
 
  Derivative
  
    - fatiguability 
(also fatigability)
 n.
  - fatiguable 
(also fatigable)
 adj.
 
   
  Etymology
  C17 (in the sense ‘task that causes weariness’): from Fr. fatigue (n.), fatiguer (v.), from L. fatigare ‘tire out’, from ad fatim, affatim ‘to satiety or surfeit’.