from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To surpass (another) in performance.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To perform better than something or someone.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. be or do something to a greater degree
out- + perform (Wiktionary)