evacuation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of evacuating or the condition of being evacuated.
• noun Discharge of waste materials from the excretory passages of the body, especially from the bowels.
• noun The material so discharged.

from The Century Dictionary.

• noun The act of evacuating or exhausting; the act of emptying or clearing of contents; clearance by removal or withdrawal, as of an army or garrison: as, the evacuation of the bowels; the evacuation of a theater, or of a besieged town.
• noun A diminution of the fluids of an animal body by cathartics, venesection, or other means; depletion.
• noun Abolition.
• noun That which is evacuated or discharged; especially, a discharge by stool or other natural means: as, dark-colored evacuations.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of emptying, clearing of the contents, or discharging.
• noun (Mil.) Withdrawal of troops from a town, fortress, etc.
• noun (Med.) Voidance of any matter by the natural passages of the body or by an artificial opening; defecation; also, a diminution of the fluids of an animal body by cathartics, venesection, or other means.
• noun That which is evacuated or discharged; especially, a discharge by stool or other natural means.
• noun obsolete Abolition; nullification.
• noun the anniversary of the day on which the British army evacuated the city of New York, November 25, 1783.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of emptying, clearing of the contents, or discharging, including creating a vacuum.
• noun Withdrawal of troops or civils from a town, fortress, etc.
• noun Voidance of any matter by the natural passages of the body or by an artificial opening; defecation; also, a diminution of the fluids of an animal body by cathartics, venesection, or other means.
• noun The act of evacuating; leaving a place in an orderly fashion; especially for protection
• noun That which is evacuated or discharged; especially, a discharge by stool or other natural means.
• noun Abolition; nullification.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the bodily process of discharging waste matter
• noun the act of removing the contents of something
• noun the act of evacuating; leaving a place in an orderly fashion; especially for protection