leading edge ( synonym found)
Definition of leading edge:

°(aeronautics) The frontmost edge of a wing or other airfoil of an aircraft; sometimes contains slots or slats.
°(by extension) The foremost part of a trend etc; a vanguard.
Definition of leading edge:

°(aeronautics) The frontmost edge of a wing or other airfoil of an aircraft; sometimes contains slots or slats.
°(by extension) The foremost part of a trend etc; a vanguard.
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