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Nautical The edge of a sail that faces the wind.
(noun)
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The front edge of an airplane propeller blade or wing.
(noun)
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The foremost position in a trend or movement; the vanguard: "a company on the leading edge of machine-tool technology” ( Christian Science Monitor).
(noun)
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Someone or something occupying such a position: "Together they are the leading edge of a new wing of historians known as cliometricians” ( Timothy Foote).
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.