the world > space > relative position > closed or shut condition > [noun] > water- or air-pressure-tight closure (11)
= hermetic seal at hermetic, adj. 2b.
transferred and figurative. hermetic seal, hermetic sealing: air tight closure of a vessel, esp. a glass vessel, by fusion, soldering, or welding…
The state of being watertight. Also figurative.
the condition of being pressure-tight.