logic

noun
log·​ic | \ ˈlä-jik How to pronounce logic (audio) \

Definition of logic

1a(1) : a science that deals with the principles and criteria of validity of inference and demonstration : the science of the formal principles of reasoning a professor of logic
(2) : a branch or variety of logic modal logic Boolean logic
(3) : a branch of semiotics especially : syntactics
(4) : the formal principles of a branch of knowledge the logic of grammar
b(1) : a particular mode of reasoning viewed as valid or faulty She spent a long time explaining the situation, but he failed to see her logic.
(2) : relevance, propriety could not understand the logic of such an action
c : interrelation or sequence of facts or events when seen as inevitable or predictable By the logic of events, anarchy leads to dictatorship.
d : the arrangement of circuit elements (as in a computer) needed for computation also : the circuits themselves
2 : something that forces a decision apart from or in opposition to reason the logic of war

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Other Words from logic

logician \ lō-​ˈji-​shən How to pronounce logician (audio) \ noun

How are logistics and logic related?

Logistics follows the same pattern of other plural nouns—such as ballistics, linguistics, statistics, or physics—that represent fields of study and take either a singular or plural verb.

Logic, used strictly in the singular, is a science that deals with the formal principles of reason. If a visitor walks in the house with wet hair, it is logical for one to assume that it is raining outside. Logistics, which involves such concerns as the delivery of personnel or supplies in an efficient manner, can often employ logic, such as by reasoning out the path least likely to interrupt the flow of a delivery:

As with many other areas of the economy, the digital revolution is having a profound effect on delivery logistics. The combination of mobile computing, analytics, and cloud services, all of which are fueled by the Internet of Things (IoT), is changing how delivery and fulfillment companies are conducting their operations.
—Andrew Meola, Business Insider, 14 Oct. 2016

Both logic and logistics ultimately derive from the Greek logos, meaning "reason." But while logic derives directly from Greek, logistics took a longer route, first passing into French as logistique, meaning "art of calculating," and then into English from there.

Examples of logic in a Sentence

If you just use a little logic, you'll see I'm right. There's no logic in your reasoning. There's some logic to what he says. There's a certain logic in what he says. The revolution proceeded according to its own logic. the logic of the situation
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Recent Examples on the Web

Following this logic, zyuko22 posits that the key to killing the Night King is burning down this hypothetical Grand Weirwood Tree with a flaming sword—just as Beric mimicked in the episode. Christopher Rosa, Glamour, "This Theory Suggests Game of Thrones Already Revealed How to Kill the Night King," 18 Apr. 2019 So, doesn't neglecting to bolster boys along with the girls, by this logic, actually limit their potential? Christine Michel Carter, Harper's BAZAAR, "How Feminism Is Stifling Our Sons," 22 Feb. 2019 Which shouldn’t surprise anybody as the Flyers continue to chase a playoff opportunity that, by all logic, has no business existing. Geoff Baker, The Seattle Times, "Former Everett Silvertips goalie Carter Hart putting on one-man show to keep Philadelphia Flyers in playoff hunt," 11 Feb. 2019 By this logic, that means at least 45 million people have watched at least 70 percent of Bird Box. Julia Alexander, The Verge, "Netflix says over 45 million accounts watched Bird Box — here’s what that means," 30 Dec. 2018 This logic surfaced amidst the litany of tweets praising Okoumou for what seemed like not-of-Earth physical agility and a fearlessness that set her apart from other people. Jenn M. Jackson, Teen Vogue, "Black Women Are Not Your Superheroes," 9 July 2018 When powerful anticolonial movements emerged around the world in the late nineteenth century, the appeal of this logic waned. Priya Satia, The New Republic, "What Mass Shootings and Big Data Have in Common," 10 May 2018 By the same logic, the substances in fingerprints should vary in a similar way, and some early attempts have been made to demonstrate this. Melanie Bailey, Scientific American, "The Hidden Data in Your Fingerprints," 27 Apr. 2018 Where the average person would stop at 5-inch heel or 3-inch platform, Gaga prefers footwear that defies logic. Janelle Okwodu, Vogue, "Lady Gaga’s Highest, Wildest, and Fiercest Heels," 10 Sep. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'logic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of logic

12th century, in the meaning defined at sense 1a(1)

History and Etymology for logic

Middle English logik, from Anglo-French, from Latin logica, from Greek logikē, from feminine of logikos of reason, from logos reason — more at legend

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Statistics for logic

Last Updated

10 May 2019

Look-up Popularity

Time Traveler for logic

The first known use of logic was in the 12th century

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More Definitions for logic

logic

noun

English Language Learners Definition of logic

: a proper or reasonable way of thinking about or understanding something
: a particular way of thinking about something
: the science that studies the formal processes used in thinking and reasoning

logic

noun
log·​ic | \ ˈlä-jik How to pronounce logic (audio) \

Kids Definition of logic

1 : a proper or reasonable way of thinking about something : sound reasoning There's no logic in what you said.
2 : a science that deals with the rules and processes used in sound thinking and reasoning

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More from Merriam-Webster on logic

Thesaurus: All synonyms and antonyms for logic

Spanish Central: Translation of logic

Nglish: Translation of logic for Spanish Speakers

Britannica English: Translation of logic for Arabic Speakers

Britannica.com: Encyclopedia article about logic

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