Question

What is the definition for the term airlock?

Answer 1

I'm not sure of the context, so I will give you a two-4-one

a blockage of the flow in a pump or pipe, caused by an air bubble.

a compartment with controlled pressure and parallel sets of doors, to permit movement between areas at different pressures.

Answer 2

An intermediate chamber with two airtight doors or openings to permit passage between two dissimilar spaces (such as two places of unequal atmospheric pressure)