from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Impossible to replace: irreplaceable antiques.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. That which cannot be replaced.
from The Century Dictionary and Cyclopedia
- Not replaceable; that cannot be replaced; not admitting of replacement or substitution.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. impossible to replace
ir- + replaceable (Wiktionary)