'Leading edge' definitions:

Definition of 'leading edge'

(from WordNet)
noun
Forward edge of an airfoil

Definition of 'Leading edge'

From: GCIDE
  • Leading edge \Lead"ing edge\n.
  • 1. (Aeronautics) the front edge of an airfoil; same as {Advancing edge}, above. [Webster 1913 Suppl.]
  • 2. the front edge of anything that moves; also used metaphorically, as the leading edge in art. See also cutting edge. [PJC]