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1. Nautical The edge of a sail that faces the wind.
2. The front edge of an airplane propeller blade or wing.
a. The foremost position in a trend or movement; the vanguard: "a company on the leading edge of machine-tool technology" (Christian Science Monitor).
b. Someone or something occupying such a position: "Together they are the leading edge of a new wing of historians known as cliometricians" (Timothy Foote).