GNU Collaborative International Dictionary of English

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Found one definition

  1.       
    Leading 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, “leading edge in art”. See also cutting edge.

    [PJC]