Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. In or of the form of an argument in which one event is asserted to be the cause of a later event simply by virtue of having happened earlier: coming to conclusions post hoc; post hoc reasoning.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. after the fact
  • adv. after the fact
  • n. An instance of the post hoc ergo propter hoc fallacy, in which temporal order is confused with causation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the logical fallacy of believing that temporal succession implies a causal relation

Etymologies

Latin, short for post hoc, erg┼Ź propter hoc, after this, therefore because of this : post, after + hoc, neuter of hic, this.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin post hoc (Wiktionary)
From Latin post hoc ergo propter hoc (Wiktionary)

Examples

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