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 logic (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 That logic, which was also adopted by the Trump administration to sharply cut refugee numbers, drew criticism from refugee advocates who accused Mr. Biden of conflating two different immigration systems. New York Times, "In Another Reversal, Biden Raises Limit on Number of Refugees Allowed Into the U.S.," 3 May 2021 That’s certainly logic indeed, but not everyone wants to wait that long to pick up a new television. Maren Estrada, BGR, "Amazon has a stunning 4K Roku TV with 2,000 5-star reviews for $360," 3 May 2021 Any commercial transaction in which data is available to corroborate that terms have been satisfied offers a plausible scenario for application when counterparties agree upon business logic, data sources and terms. Andrew Bruce, Forbes, "It's Time For Modern Enterprise To Automate Transactions," 9 Apr. 2021 The traditional logic for bridging trials, or local clinical trials, is sound. Dinesh Thakur, STAT, "India shouldn’t insist on ‘bridging trials’ in the middle of a pandemic," 8 Apr. 2021 But logic, shmogic; the girls are the movie’s MacGuffins, alternately seen as menacing Nazis and innocent pawns. Helen Shaw, Vulture, "Six Minutes to Midnight Runs Out the Clock," 24 Mar. 2021 And the product-planning logic there—more traction, less power and refinement—is even harder to understand when applied to a luxury car. John Pearley Huffman, Car and Driver, "Tested: 2021 Lexus ES250 AWD Gets in Touch with Its Inner Camry," 17 Mar. 2021 The equipment will undergo logic and accuracy testing, which state law requires, at 2 p.m. Monday, according to Megan Gilbertson, an Elections Department spokesperson. Taylor Seely, The Arizona Republic, "Maricopa County election officials enact backup plan for upcoming Goodyear election due to Senate subpoenas," 6 Mar. 2021 People subscribing to Dutcher’s logic — best player on best team — or valuing both ends of the floor will vote for Mitchell. Mark Zeigler, San Diego Union-Tribune, "3 thoughts: No. 19 SDSU 71, UNLV 62 ... player of the year, how Schakel was able to play, and bubble watch," 4 Mar. 2021

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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Time Traveler for logic

Time Traveler

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

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Statistics for logic

Last Updated

6 May 2021

Cite this Entry

“Logic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/logic. Accessed 10 May. 2021.

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More Definitions for logic



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


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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Comments on logic

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