Meaning of leading edge

lead'ing edge'

Pronunciation: (lē'ding), [key]
  1. the edge of an airfoil or propeller blade facing the direction of motion.
  2. something that is or represents the most advanced or innovative aspect of a field, activity, profession, etc.; forefront; vanguard: the leading edge of technology.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.