ORIGINAL: Bax

OK, it is CHORD.

INCIDENCE is the angle of the wing with respect to the reference line through the fuselage...the datum line from front to rear. The horizontal stabilizer can also have an angle of incidence.

DECALAGE is the commonly-used term for the angular relationship between the wing and horizontal stabilizer. This has also been referred to as LONGITUDINAL DIHEDRAL.

ANGLE OF ATTACK is the angle between the wing and the oncoming airstream when in flight. "Flight" starts when the aircraft begins its takeoff run, and ends when it completes the landing roll...at least as far as this discussion is concerned.