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angle of attack (plural angles of attack)

  1. Used other than with a figurative or idiomatic meaning: see angle,‎ attack.
  2. (aeronautics) The angle between the chord line of an airfoil and the airflow over it; one of the determiners of the amount of lift produced by an airfoil.
  3. (nautical) The angle between a mid-sail and the direction of the wind.