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What is an airlock?

What is an airlock? Here are some definitions.

Noun
  1. A sealed, airtight chamber, such as in a manned spacecraft or submarine, used to provide access to and from the sealed area without allowing air out or water in.
  2. Alternative form of air lock
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Examples
The shelters work by inflating quickly and have an airlock and pressure system which keeps out contamination.
As he smashed his fist the fifth time, the airlock depressurised, and a gush of air entered the airlock.
I have no memory of climbing into my space suit and double-checking all the seals before I must have vented the airlock.
Their work started about an hour behind schedule because of trouble with an airlock.
By the time they closed the inner hatch of the airlock the blood-red droplights had come on.
With a secure airlock established between the two ships, the Scout transferred over to the derelict.

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