Last Week's Definition:
Leadership requires the belief and pursuit of something larger than oneself, helping others on your way towards a collective goal exemplifies a leader.
New Definition:
Optimal leadership requires the ability to step back and view one's place and role in the "big picture". Moving beyond the daily tasks and conflicts to plan at a higher level.
Analysis:
This week I have been thinking a lot about getting caught up in the mundane and the associated stress. I relate this a little to the Heifetz reading, using the balcony strategy to both view your position within a group, but also within the context of an ongoing project. We have the tendency to get really worked up about the little steps, leadership requires a constant eye on the end goal.
Heifetz, R. A., & Linsky, M. (2002). "Get on the balcony." Leadership on the Line: Staying alive through the dangers of leading (pp. 51 - 74). Boston: Harvard Business School Press.
Kegan, R., & Lahey, L. L. (2009). "Identifying Each Person's One Big Thing" (pp. 63 - 67). Boston: Harvard Business Press.

Your new definition is fine, but I'm not sure it's all encompassing. You've thrown the baby out with the bathwater I think. Try to do some more additive definitions for the next few weeks.
Grade: 9 out of 10 points
Clarity of the new definition: 1 points out of 2 possible
Thoughtfulness of the analysis: 6 points out of 6 possible
Grammar, spelling, and APA style: 2 point out of 2 possible