What is a First Ascent?

In the good old days before the interwebs ruined climbing and everything had been sent, pre-grizzled hardpersons climbed peaks nobody had ever stood atop. Those were first ascents. A little later, people climbed the same peaks via completely different terrain, maybe via more difficult, enjoyable, aesthetic, or seasonally-dependent condtions. They went to the summit as well. Those, also, were first ascents. But in the days of infinite variations, stopping at the end of "technical difficulties" 1/2way up the mountains, and failed attempts retroactively labeled as new climbs on features that might not really have summits, what is a first ascent?

...The Rest of the Story

Twelve years ago, when Scott and I were in middle school and likely more interested in Magic Cards than mountains, Jim Donini and Greg Crouch climbed the West Pillar of Cerro Pollone, in Chilean Patagonia. The account of their climb (and the fact that it hadn't been completed to the summit)  inspired me several years ago:

"...featured tons of high-angle free climbing on superb rock. The summit view from the top of the pillar is astonishing ... probably the best I've had in Patagonia. ... I think the whole route would go free with just a few short sections of 5.11. The right team should be able to peel the whole thing off in a single day."

Well.