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

Authors like Dickinson or Joyce or Hopkins had slowed me down before, with pyrotechnic vocabulary or serpentine logic. The New Yorker, "Toni Morrison, Remembered By Writers," 10 Aug. 2019 Our recent assessment of private military activity, along with work from academics Deborah Avant and Kara Kingma Neu, questions this logic. Jonathan Powell, Quartz Africa, "The controversial role of private military and security companies in Africa," 9 Aug. 2019 The logic tree for the Conn family’s decision looked like this: Bulletproof Problem Solving, Wiley, 2019. Cassie Werber, Quartz at Work, "Solve your next big problem at work or home with the help of a logic tree," 7 Aug. 2019 One of the most interesting interaction-less bugs Silvanovich found was a fundamental logic issue that could have allowed a hacker to easily extract data from a user’s messages. Lily Hay Newman, WIRED, "Hackers Can Break Into an iPhone Just by Sending a Text," 7 Aug. 2019 The audience, however, seemed to find the right sort of logic in it. Miguel Garcia Jr., Billboard, "The 10 Best Musical Moments of Hard Summer 2019 With Shoreline Mafia, Lauren Lane, Kid Cudi & More," 6 Aug. 2019 Employing the morally disastrous logic that the enemy of your enemy is your friend, the Democrats have allowed President Trump to troll them into extolling Sharpton. Kyle Smith, National Review, "Al Sharpton Is Not a Civil-Rights Hero," 31 July 2019 Johnson, who tells me that the majority of her followers are women between the ages of 25 and 34, says there’s logic to this. Cady Drell, Marie Claire, "Is It Possible to Live Trash-Free?," 30 July 2019 Of course, all the logic and planning in the world can be undermined by circumstances. Roy S. Johnson | Rjohnson@al.com, al.com, "Johnson: Atlanta ’96 shows how to make World Games succeed," 21 July 2019

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

16 Aug 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

of or relating to the heavens

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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!