fatigue

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Physical or mental weariness resulting from exertion.
2. n. Something, such as tiring effort or activity, that causes weariness: the fatigue of a long hike.
3. n. Physiology The decreased capacity or complete inability of an organism, an organ, or a part to function normally because of excessive stimulation or prolonged exertion.
4. n. The weakening or failure of a material, such as metal or wood, resulting from prolonged stress.
5. n. Manual or menial labor, such as barracks cleaning, assigned to soldiers.
6. n. Clothing worn by military personnel for labor or for field duty.
7. v. To tire with physical or mental exertion; weary.
8. v. To create fatigue in (a metal or other material).
9. v. To be or become fatigued. See Synonyms at tire¹.

Century Dictionary and Cyclopedia

1. To weary with labor or any bodily or mental exertion; lessen or exhaust the strength of by severe or long-continued exertion, by trouble, by anything that harasses, etc.; tire.
2. Synonyms Weary, Jade, etc. See tire, verb
3. n. A feeling of weariness following bodily labor or mental exertion; a sense of loss or exhaustion of strength after exertion, trouble, etc.
4. n. A cause or source of weariness; labor; toil: as, the fatigues of war.
5. n. Specifically The labors of military men distinct from the use of arms; fatigue-duty: as, a party of men on fatigue.
6. n. The weakening of a metal bar by the repeated application and removal of a load considerably less than the breaking-weight of the bar, as when car-axles break from the repeated blows and strains which they experience.
7. n. Synonyms Fatigue, Weariness, Lassitude. Fatigue is more often physical, but also mental, and is generally the result of active and strenuous exertion: as, the fatigue of ten hours' work, or of close application to books. Weariness may be the same as fatigue; it is, more often than fatigue, the result of less obvious causes, as long sitting or standing in one position, importunity from others, delays, and the like. Fatigue and weariness are natural conditions, from which one easily recovers by rest. Lassitude is a relaxation with languor, the result of greater fatigue or weariness than one can well bear, and may be of the nature of ill health. The word may, however, be used in a lighter sense.

Wiktionary

1. n. A weariness caused by exertion; exhaustion.
2. n. A menial task, especially in the military.
3. n. A type of material failure due to cumulative effects of cyclic loading.
4. v. transitive to tire or make weary by physical or mental exertion
5. v. intransitive to lose so much strength or energy that one becomes tired, weary, feeble or exhausted

GNU Webster's 1913

1. n. Weariness from bodily labor or mental exertion; lassitude or exhaustion of strength.
2. n. The cause of weariness; labor; toil.
3. n. The weakening of a metal when subjected to repeated vibrations or strains.
4. v. To weary with labor or any bodily or mental exertion; to harass with toil; to exhaust the strength or endurance of; to tire.

WordNet 3.0

1. n. used of materials (especially metals) in a weakened state caused by long stress
2. v. lose interest or become bored with something or somebody
3. n. temporary loss of strength and energy resulting from hard physical or mental work
4. n. (always used with a modifier) boredom resulting from overexposure to something
5. v. exhaust or get tired through overuse or great strain or stress
6. n. labor of a nonmilitary kind done by soldiers (cleaning or digging or draining or so on)