decalage

noun4

1. •
   The difference in angle of incidence between the main wing and horizontal stabilizer, or between the canard and main wing, of an airplane.
2. •
   The difference in angle of incidence of the two wings of a biplane.
3. •
   In Piagetian developmental psychology, the inability to apply a learned function across all problems (horizontal decalage) or across different developmental stages (vertical decalage).
4. •
   The angle between two geometric lines that define an aerofoil.