ratiocination

noun

ra·​ti·​o·​ci·​na·​tion ˌra-tē-ˌō-sə-ˈnā-shən How to pronounce ratiocination (audio)
ˌra-shē-,
-ˌä-
1
: the process of exact thinking : reasoning
2
: a reasoned train of thought

Did you know?

Edgar Allan Poe is said to have called the 1841 story "The Murders in the Rue Morgue" his first "tale of ratiocination." Many today agree with his assessment and consider that Poe classic to be literature's first detective story. Poe didn't actually use ratiocination in "Rue Morgue," but the term does appear three times in its 1842 sequel, "The Mystery of Marie Roget." In "Marie Roget," the author proved his reasoning ability (ratiocination traces to ratio, Latin for "reason" or "computation"). The second tale was based on an actual murder, and as the case unfolded after the publication of Poe's work, it became clear that his fictional detective had done an amazing job of reasoning through the crime.

Examples of ratiocination in a Sentence

as an expert in ratiocination, the detective Sherlock Holmes has few rivals
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The underground man is someone who is cursed with ratiocination. Sean Illing, Vox, 9 Dec. 2024 No ratiocination similar to Parker’s point system. WIRED, 23 Feb. 2023

Word History

First Known Use

1532, in the meaning defined at sense 1

Time Traveler
The first known use of ratiocination was in 1532

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Cite this Entry

“Ratiocination.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ratiocination. Accessed 3 Apr. 2025.

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