As an exercise in clarifying my thoughts, I created definitions for the words lead and leadership:

lead
  1. v. To influence people to freely serve a shared purpose.
leadership
  1. n. The process of influencing people to freely serve a shared purpose. (The process of leading.)

How well does this definition fit your idea of leadership? What's your definition?

[Update July 15: Shortened "ongoing process" to "process." I think the word process implies ongoing.]