e·vac·u·a·tion 
(ĭ-văk′y-āshən)
(ĭ-văk′y-āshən)n.
1. The act of evacuating or the condition of being evacuated.
2. Physiology
a. Discharge of waste materials from the excretory passages of the body, especially from the bowels.
b. The material so discharged.