1. Not to be coerced; incapable of being compelled or forced.
2. (Science: physics) Not capable of being reduced to the form of a liquid by pressure; said of any gas above its critical point; also particularly of oxygen, hydrogen, nitrogen, and carbon monoxide, formerly regarded as incapable of liquefaction at any temperature or pressure.
3. (Science: physics) That can note be confined in, or excluded from, vessels, like ordinary fluids, gases, etc.; said of the imponderable fluids, heat, light, electricity, etc.
Origin: Pref. In- not _ coercible: cf. F. Incoercible.