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air right

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noun
  1. a right of way in the air space above a property owner's land and the immovable property on it, subject to the public right of air navigation above the property at a legally prescribed altitude.
  2. such a right sold or leased for use or occupation, especially on a support elevated above an immovable property, as for the erection of an office building over a railroad track.

Origin of air right

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018