affirmation of the consequent

Definition of affirmation of the consequent

: the logical fallacy of inferring the truth of the antecedent of an implication from the truth of the consequent (as in, “if it rains, then the game is cancelled and the game has been cancelled, therefore it has rained”)

called also assertion of the consequent

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of affirmation of the consequent

1854, in the meaning defined above

Keep scrolling for more

Learn More About affirmation of the consequent

Time Traveler for affirmation of the consequent

Time Traveler

The first known use of affirmation of the consequent was in 1854

See more words from the same year

Dictionary Entries Near affirmation of the consequent


affirmation of the consequent


See More Nearby Entries 

Statistics for affirmation of the consequent

Cite this Entry

“Affirmation of the consequent.” Dictionary, Merriam-Webster, Accessed 24 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon
Seen & Heard
People are talking about


Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
True or False

Test your knowledge - and maybe learn something along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!