What is wing inductance? I am currently trying to understand the ground roll and climbing stage of normal aircraft.
I came across this formula which is an expression of the airplanes drag:

$X_a = c_{{x}_a} S \frac{\rho V^2}{2}$

where: $ c_{{x}_a} = c_{x0} + A c^2_{x_{a}}$


S: wing area
$\rho$: air density
V: velocity
$c_{x0}$: drag coefficient when the lifting force = 0
$c_{x}$: drag coefficient


A is said to be the wing inductance. Could somebody explain what is meant by wing inductance?
$$A = \frac{1}{\pi \cdot e \cdot AR}$$
where
$\pi = 3.14159....$, $e$ is the Oswald efficiency factor, and $AR$ is aspect ratio of the wing.