leading edge

1. The frontmost edge of a wing or other airfoil of an aircraft; sometimes contains slots or slats.

   Anströmkante, Profilnase

   forward edge of an airfoil

2. The foremost part of any physical object.

   the leading edge of a cricket bat

3. (broadly)The foremost part of a trend etc; a vanguard.

4. The forefront of practice or technology.

regular