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

Some logic could also be inserted to consider the reliability of the AOA readings when the plane is still on the ground. Dominic Gates, The Seattle Times, "Lion Air pilots struggled against Boeing’s 737 MAX flight-control system, black-box data shows," 27 Nov. 2018 Archigram’s flexible buildings and flexible thinking were inevitably part of such a logic. Patrick Sisson, Curbed, "How the Archigram architectural collective, profiled in a comprehensive new book, designed for a more radical, and random, future," 26 Nov. 2018 Virgo is an earth sign associated with logic, reason, and responsibility, which may at first seem quite dissimilar to Leo’s dynamic bravado. Aliza Kelly Faragher, Allure, "What August's Aries Horoscope Means for You," 30 July 2018 Speaking about Lift in the same IndieWire Studio interview, Hammer emphasized the CEO’s peculiar, consistent logic: [Lift is] a guy who doesn’t consider himself like a fanciful, crazy character. Hannah Giorgis, The Atlantic, "Sorry to Bother You Has an Eerily Familiar Villain," 10 July 2018 Feminists will need to employ circular logic to conjure forth a discriminatory barrier in Scrabble: Males’ excellence at a certain activity itself keeps females out. Heather Mac Donald, WSJ, "Sorry, Feminists, Men Are Better at Scrabble," 16 Nov. 2018 The passengers explore their sleek colony ship looking for answers, and finding plenty of opportunities for jump-scares and classic terrible horror-character logic. Samantha Nelson, The Verge, "YouTube’s tech-noir series Origin is Lost… in space," 14 Nov. 2018 In order to replace certain hardware components, such as the Touch ID sensor or the logic board on new Macs, the provider must run a specific piece of diagnostic software. Valentina Palladino, Ars Technica, "Apple’s T2 chip will block some third-party repairs of new devices," 13 Nov. 2018 Page administrators aren't necessarily buying into Facebook's logic. Sam Blum, Popular Mechanics, "Facebook's Fake News Problem Isn't Russian Anymore—It's Homegrown," 12 Oct. 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

6 Dec 2018

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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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