from The American Heritage® Dictionary of the English Language, 4th Edition
- n. One that is original or innovative.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. First person to do, make or fight for something. A pioneer; a seminal person.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. someone who helps to open up a new line of research or technology or art
From ground + breaker. (Wiktionary)