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 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
See More

Recent Examples on the Web

The president and his team are operating on the simple logic that tariffs on imported cars and car parts would punish foreign makers, to the benefit of those brands that call America home. Alexander Stoklosa, Car and Driver, "President Trump Appears to Kick the 25 Percent Auto Tariff Can down the Road," 15 May 2019 Nouvel designed a museum that behaves like music, with an underlying logic but a persistent sense of expectation. Julie Lasky, ELLE Decor, "ED First Look: The National Museum of Qatar," 26 Mar. 2019 But if Kim does disarm, then Congress may see less logic in spending $6 billion or more to expand a missile defense system based in Alaska that is designed mainly with North Korea in mind. Robert Burns, Anchorage Daily News, "If North Korea disarms, will U.S. missile defense lose favor?," 26 June 2018 That regurgitated flawed logic is contradictory to the fundamental nature of protests. Michael Harriot, The Root, "Donald Trump Admits the NFL Protests Actually Worked," 8 June 2018 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

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

Statistics for logic

Last Updated

24 May 2019

Look-up Popularity

Time Traveler for logic

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

See more words from the same century

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

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

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

a strong desire or propensity

Get Word of the Day daily email!

Test Your Vocabulary

Challenging Vocabulary Quiz Returns!

  • stylized drawing of woman pole vaulting across gap to get trophy
  • Which is a synonym of fuliginous?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

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!