OK I'm talking to France and UK here, and I am a Murican. Incidence was taught to me a very long time ago, it is the discrepancy between Longitudinal axis and the chord line expressed in degrees ('always' positive). The AoA is as John Farley states, the chord line relative to airstream. Let's don't get too precious, What who says is what matters to different people, and let us not wander into standards, Internationale, Eh?
dirty side down, bear