Question

what is aerial velocity?

Answer 1

Areal velocity (sector velocity, sectorial velocity) is the rate at which area is swept out by a particle as it moves along a curve. In many applications, the curve lies in a plane, but in others, it is a space curve.

Answer 2

In classical mechanics, areal velocity  is the rate at which area is swept out by a particle as it moves along a curve. 
It must be areal.