Also found in: Thesaurus, Medical, Idioms, Encyclopedia.
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).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014