<p><strong>Noun</strong></p><ul><li>weariness from bodily or mental exertion.</li><li>a cause of weariness; slow ordeal; exertion: the fatigue of driving for many hours.</li><li>Physiology: temporary diminution of the irritability or functioning of organs, tissues, or cells after excessive exertion or stimulation.</li><li>Civil Engineering: the weakening or breakdown of material subjected to stress, especially a repeated series of stresses.</li><li>Also called fatigue duty.</li><li>Military: labor of a generally nonmilitary kind done by soldiers, such as cleaning up an area, digging drainage ditches, or raking leaves.</li><li>the state of being engaged in such labor: on fatigue.</li><li>fatigues: Military.</li></ul><p><strong>Adjective</strong></p><ul><li>of or relating to fatigues or any clothing made to resemble them: The guerrilla band wore fatigue pants and field jackets.</li><li>She brought fatigue shorts to wear on the hike.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>fatigued, fatiguing: to weary with bodily or mental exertion; exhaust the strength of: Endless chatter fatigues me.</li><li>Synonyms: enervate, debilitate, tire.</li><li>Civil Engineering: to subject (a material) to fatigue.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>fatigued, fatiguing: to become tired or exhausted.</li><li>Civil Engineering: (of a material) to undergo fatigue.</li></ul>