logic

noun
log·​ic | \ ˈlä-jik \

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 \ 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

The finale suffered from a lot of large jumps in logic, or at least plot leaps that we were expected to accept. Daniel Fienberg, The Hollywood Reporter, "Critic's Notebook: 'Handmaid's Tale' Finale a Case of Brilliant Acting, Frustrating Storytelling," 11 July 2018 More evidence of Russian culpability generates more response from his targets, which, processed through the peculiar logic of Greenwald’s brain, becomes evidence of an anti-Russian witch hunt. Jonathan Chait, Daily Intelligencer, "Glenn Greenwald Tells Russians Liberals Are Blaming Them As Excuse for Clinton," 9 July 2018 In the intentionally brutal logic of President Trump’s policy of separating immigrant children from their parents at the US border, Wil is actually among the lucky kids. Liz Goodwin, BostonGlobe.com, "Down on the border, a new trail of tears," 10 June 2018 During this lunation, there is no light in the sky, so don't even bother trying to ground your feelings in logic. Aliza Kelly Faragher, Allure, "What April's Taurus Horoscope Means for You," 29 Mar. 2018 Again, the political logic of this stance is impeccable. Reihan Salam, The Atlantic, "The GOP’s Public-Education Dilemma," 29 May 2018 More broadly, Russia must demilitarize its consciousness, recognizing that the logic of war is defective and archaic and that modern problems are more often solved through battles of ideas. Konstantin Dobrynin, WSJ, "Russia’s Future Is Rapped in an Enigma," 14 Jan. 2019 The Federal Energy Regulatory Commission denied that plan on the grounds that the logic behind it was unconvincing. Megan Geuss, Ars Technica, "Trump tried to rescue coal. Instead, coal capacity retirements doubled in 2018," 29 Nov. 2018 What is the logic for pushing back the new structure, especially in neighborhoods that aren’t part of a historic district? Inga Saffron, Philly.com, "When trading up isn't an option, Philadelphia rowhouse owners build up | Inga Saffron," 21 June 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

15 Feb 2019

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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 \

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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