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

Keep scrolling for more

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
See More
Recent Examples on the Web But dwindling populations create their own inexorable logic. Tyler Cowen, Star Tribune, "What the world needs now is more people," 2 Apr. 2021 All students, by our logic, were students of color. Françoise Mouly, The New Yorker, "R. Kikuo Johnson’s “Delayed”," 29 Mar. 2021 Their logic is sound: A home run beats the shift every time. Mike Digiovanna Staff Writer, Los Angeles Times, "MLB is deadening baseballs to liven up the game. Pitchers and managers approve," 22 Feb. 2021 His logic was adopted by the High Court last summer (Seila Law v. CFPB). The Editorial Board, WSJ, "Biden Learns to Love Brett Kavanaugh," 21 Jan. 2021 Sometimes our logic isn't consistent with what’s backed by science and medical professionals. Isabel Keane, USA TODAY, "Tired of COVID-19? Here's how experts say to fight off pandemic fatigue and stay safe.," 6 Jan. 2021 But proponents say that doesn't matter: The currency obeys its own internal logic. CBS News, "Bitcoin surges past $20,000, topping previous peak — 3 years ago," 18 Dec. 2020 At times, Pluckrose and Lindsay write as if these theories are free-floating ideas developing according to their own internal logic. Park Macdougald, Washington Examiner, "Is postmodernism really worthless?," 17 Dec. 2020 Lexus says that the 10-speed transmission has gotten some love; its shift logic has been updated to keep the engine in a more responsive section of the powerband. Roberto Baldwin, Car and Driver, "2021 Lexus LS500 Starts at $77,025," 11 Nov. 2020

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.

See More

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

Keep scrolling for more

Learn More about logic

Time Traveler for logic

Time Traveler

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

See more words from the same century

Statistics for logic

Last Updated

12 Apr 2021

Cite this Entry

“Logic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/logic. Accessed 17 Apr. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

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

Keep scrolling for more

Comments on logic

What made you want to look up logic? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
 AlphaBear 2

Spell words. Make bears.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!