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com·press·ibil·i·ty | \ kəm-ˌpre-sə-ˈbi-lə-tē 
\
\Definition of compressibility
: capability of compression : the ability of something (such as a fluid) to be reduced in volume or size under pressure
When that water expands, it turns into a gas. The gas forms bubbles and those bubbles dilute the compressibility of the brake fluid. — Motocross Action Magazine … a month later there was a sweatshirt stuffed into my mail box and I was overcome by its compressibility.— David Mamet
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The first known use of compressibility was in 1691
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