from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A lack of logic.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Lack of logic; unreasonableness; a fallacy.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. invalid or incorrect reasoning
From il- + logic, after illogical. (Wiktionary)