from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having existed or persisted for a long time: a longtime friend; a longtime resident of Detroit.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having endured for a long period of time.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. of long duration
long + time (Wiktionary)