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Webster 1913 Edition

Noun.

[Cf. F.

incompressibilité

The quality of being incompressible, or incapable of reduction in volume by pressure; – formerly supposed to be a property of liquids.

The

incompressibility

of water is not absolute.

Rees.

Noun.

[See Incompressible.] The quality of resisting compression, or of being incapable of reduction by force into a smaller compass.

incompressibility ‎(countable and uncountable, plural incompressibilities)

The quality of being incompressible, of not compressing under pressure
Water has a high degree of incompressibility.
(physics) The bulk modulus or modulus of incompressibility, measured in either electron volts or dynes per square centimeter.
- 1997, Ignazio Bombaci, Physical Review C, volume 55, DOI:Observational evidence for strange matter in compact objects from the x-ray burster 4U 1820-30:
  The value 120 MeV for the incompressibility is unrealistically small when compared with the value ~180-240 MeV!