ORIGINAL: Rocketmagnet
No, I already told you my own personal definitions of lift and drag, which IMHO are quite simple (and they seem to be the same as definitions given by others)
Drag: the component of the force which opposes the motion through the fluid.
Lift: the remaining force.
That's a very simple and reasonable definition.
Hugo:
That definition may be too simple.
The lift to drag ratio would be constant for any airfoil if the lift would be just the ramaining force.
Please see Post #79 above, and also the attached diagrams.