Definitions

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

Etymologies

From il- +‎ logic, after illogical. (Wiktionary)

Examples

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