1. Adjective.  Not to be coerced; incapable of being compelled or forced.
  2. Adjective.  (physics, of a gas) Not capable of being reduced to liquid form by pressure.
  3. Adjective.  (physics, archaic) That cannot be confined in, or excluded from, vessels, like ordinary fluids, gases, etc.; said of heat, light, electricity, etc.

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This entry was last updated on RefTopia from its source on 3/20/2012.