decompression

Universal Words noun [U] 1 a reduction in air pressure; the act of reducing the pressure of the air: a decompression chamber (= a piece of equipment that divers sit in so that they can return slowly to normal air pressure after being deep in the sea) * decompression sickness (= severe pain and difficulty in breathing experienced by divers who come back to the surface of deep water too quickly) seealsoBENDS 2 (technical) the act or process of allowing sth that has been compressed (= made smaller) to fill the space that it originally took up: The computers have built-in video decompression capabilities.