from The Century Dictionary.

  • noun A name sometimes given to a spirit-level (which see).
  • noun A level or airway of former workings made use of in subsequent deeper mining operations for ventilating purposes.


Sorry, no etymologies found.


  • He spread his wings fully and did not move them as he climbed from air-level to air-level, but his long forked tail expanded and closed continuously.

    White Shadows in the South Seas

  • The air-level guidelines set by the E.P.A. take these factors into account and are more protective for younger classes than older ones.

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