evacuation

noun

1. (countable, uncountable)The act of evacuating; leaving a place in an orderly fashion, especially for safety.

   “The peak of the record-breaking month came during the fourth week, when the railways were called upon to handle the transport side of the official evacuation from the London area. During the first seven days of this evacuation, 175 special trains left the main London termini carrying mothers and children to the safety of the countryside.”

   “Roads on either side of the river Rhine will be closed as authorities seal off the large evacuation zone. The Unesco World Heritage Cologne Cathedral sits just outside the area.”

2. (countable, uncountable)Withdrawal of troops or civils from a town, country, fortress, etc.

   “The operating difficulties of this evacuation movement were further intensified by the fact that Sunday, June 2, saw the movement of nearly 48,000 children in 70 trains from Kentish and other East Coast towns, and 32 of these trains originated on the Southern Railway. [...] Moreover, during the period of intensive B.E.F. evacuation, the British railways also carried some 20,000,000 passengers and over 6,000,000 tons of freight.”

3. (countable, uncountable)The act of emptying, clearing of the contents, or discharging, including creating a vacuum.
4. (countable, uncountable)Voidance of any matter by the natural passages of the body or by an artificial opening; defecation; urination; also, a diminution of the fluids of an animal body by cathartics, venesection, or other means.

   “A large evening meal, deep sleep in a better bed than hers, a full evacuation, a hot bath (her own house had only a cold shower), a breakfast of bacon and eggs and sausages from Crabbe's boy — these had smoothed and restored her.”

5. (countable, uncountable)That which is evacuated or discharged; especially, a discharge by stool, urine or other natural means.

   “The Abſcess being broken an Ulcer is left behind, which may be known by the Evacuation of Matter by Vomit and Stool”

6. (countable, uncountable)Abolition; nullification.

   “evacuation of all Romish ceremonies”