from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Impossible to repeal: irrepealable laws.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. That cannot be repealed.
from the GNU version of the Collaborative International Dictionary of English
- adj. Not repealable; not capable of being repealed or revoked, as a law.
from The Century Dictionary and Cyclopedia
- Not repealable; incapable of being repealed or annulled.
ir- + repealable (Wiktionary)