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The Collaborative International Dictionary
Advancing edge

Advancing edge \Ad*van"cing edge\ (A["e]ronautics) The front edge (in direction of motion) of a supporting surface; -- contr. with following edge, which is the rear edge.

Advancing edge

Leading edge \Lead"ing edge\n.

  1. (Aeronautics) the front edge of an airfoil; same as {Advancing edge}, above.

  2. the front edge of anything that moves; also used metaphorically, as the leading edge in art. See also cutting edge.