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Longman Dictionary of Contemporary English
Boolean logic
▪ The program searches for information using Boolean logic.
fuzzy logic
logic dictates sth
▪ Logic dictates that this must be the right answer.
▪ And indeed, linking these three proposals did have a certain logic.
▪ Theology has sometimes forced a certain logic upon the thought of Irenaeus which plays it false.
▪ It was of course an argument that carried with it a certain invincible logic.
▪ Putting police in the marijuana distribution business carries a certain odd logic, to some people.
▪ But it has a certain logic.
▪ There is, to be sure, a certain logic in the view which advocates the relinquishment of doomed creatures to eternity.
▪ This price had a certain logic, being the amount of surety which each official immigrant into the country had to post.
▪ The Presocratics were rational, certainly, and employed a certain non-formal logic.
▪ The irony in all this is the circular logic of what appears to be the new strategic competition.
▪ It needs an industrial strategy founded on commercial logic rather than shortsighted bureaucratic principles.
▪ Take away or subsidise all nuclear power stations and you lose the commercial logic of the privatisation plans.
▪ This is a precious text, its publishers and authors are saying, that gloriously defies vulgar commercial logic.
▪ But in recent years commercial logic has forced them closer together, and the romance started up again.
▪ These rates are clearly a trade-off between economic logic and political expediency.
▪ When it comes to factor price equalization, economic logic is buttressed by timing.
▪ Nicholas Garnham has argued that this provision of a wide-ranging repertoire also has an economic logic.
▪ These support problem solving techniques such as rule-based systems, genetic optimisation and fuzzy logic.
▪ Research on a new microcontroller with built-in fuzzy logic co-processors is also under development.
▪ Somehow this fuzzy logic had stayed on.
▪ He said the offer was based on industrial logic.
▪ So-called industrial logic has, for example, been used to justify the acquisition of a customer or a supplier.
▪ The inexorable logic does not, however, establish that the result is morally or socially desirable.
▪ There was no inexorable train of logic which led from that day to the Holocaust.
▪ Up to the point of overload and pressure, you might say that the inexorable logic of the Hay Fever Theory does hold.
▪ Scientists have no need to explore the internal logic of the consciousness of matter simply because it does not exist.
▪ Capitalism desperately needs what its own internal logic says it does not have to do.
▪ Often it is the internal logic of a process that is the real clue to understanding it.
▪ It has to have an on board brain operating entirely by internal logic and guidance without much communication from Earth.
▪ They must interpret the internal logic which directs the actions of the actor.
▪ In other words the internal logic of the design may ignore our priorities.
▪ You don't need a complex system for that - just time and some simple logic to begin with.
▪ You need only set up elegantly simple categories and logic will whisk you to whatever conclusion you have in mind.
▪ By the application of simple logic, anyone can work out that that means that he does not like private residential care.
▪ There was a simple logic to the run, which we discovered on our return to barracks.
▪ This argument had a simple logic.
▪ But if both players accept this logic and defect, they end up worse off than if they had co-operated.
▪ Sternglass did not accept the logic that lay behind the word enough.
▪ To gain recognition unions had to accept the logic and rules of the capitalist system.
▪ It is an accepted fact of scientific logic that you can never prove something true.
▪ In the mid-1930s, however, most absolute pacifists were not yet ready to accept the apolitical logic of their beliefs.
▪ The positivist approach to human behaviour applies a similar logic.
▪ The child can think logically but can not apply logic to hypothetical and abstract problems.
▪ It was futile to try to apply logic from the outside here.
▪ He said the offer was based on industrial logic.
▪ For the song of the suffering servant helps unlock the mystery that defies logic.
▪ The Raiders could make a great second-half run, but that would defy logic.
▪ With all these artists' patches there are some sounds which are great and others which defy logic.
▪ It is an industry that, recently anyway, almost defies logic.
▪ This is a precious text, its publishers and authors are saying, that gloriously defies vulgar commercial logic.
▪ The rally has defied all odds and logic with only two, short interruptions since it began its climb in August 1982.
▪ When, defying logic, the Burt Bacharach horns come in, it's the pop moment at its life-affirming best.
▪ The afternoon stretches on and on, defying the logic of watch time.
▪ Viewers are excused the demanding task of following the logic of a Horizon exposition; the important thing is to marvel.
▪ The logical arrangement of subject headings in this section of the research proposal tends to follow the logic of the research process.
▪ Go or stay? Follow my logic or my nose.
▪ This chapter begins to follow the logic of these arguments into the heart of human behavior.
▪ Secondly, the social consequences of the technology would be inevitable, following directly from the logic of the change.
▪ We ought to follow that logic in presidential elections.
▪ In fact they follow the logic feminists identify as sexist because it assumes women's subordinate position.
▪ Close attention and hard work would be needed to follow the dubious logic of such explanations.
▪ I could never understand the logic of taking the doe rabbits away to warren systems.
▪ But if I understand the logic of supplementarity correctly, its moral implications are quite different.
▪ I have only just understood that this logic was so.
▪ Conventional programs embed the expertise in the instructions, making it very difficult to understand the logic of the problem.
▪ It is prized in cultures which use second-order systems of logic and dialectic to reason about the world.
▪ The most emotional thinkers are those who use emotion to drive logic.
▪ The program being used is KWIRS2 which allows the pupils to search for information using Boolean logic.
▪ It will operate at 3.3V and use built-in power-management logic to reduce the heat.
▪ For example, using the same logic and assuming a constant required rate of return, may be defined as follows:.
▪ To quote Lieberson once again: imagine an inquiry, using the logic of social research, into why objects fall.
circular argument/logic/reasoning
▪ Clearly the more elaborate the dress, the more dress-fasteners required, although there is here the danger of a circular argument.
▪ Failure to recognize this leads to circular arguments.
▪ Pupils can often fall back on a circular argument such as: Why is the relationship linear?
▪ The Court refused to allow itself to be caught in a circular argument as to which State needed to waive immunity first.
▪ The irony in all this is the circular logic of what appears to be the new strategic competition.
▪ This appears to be a circular argument, typical of closed-belief systems.
▪ We start by talking about a problem of circular reasoning to motivate the diagram.
defy logic/the odds etc
▪ In the event, the cyclist defied the odds and survived.
▪ That Jaime Guerrero is alive to attend the dinner probably defies the odds.
▪ I couldn't see the logic behind the decision to close the school.
▪ Sophie questioned the logic of his arguments.
▪ For example, brain circuits for learning math, logic and music are thought to develop between birth and age 4.
▪ I am good at quizzes that involve logic 41.
▪ I had a feeling that his logic would not bear close scrutiny but was too numb to argue with the ancient greenkeeper.
▪ In the end, minimizing fails because it violates the principles of behavioral logic.
▪ Such Hegelian logic put a new interpretation to history.
▪ The kind of reasoning I found in logic was very foreign.
▪ There was most definitely a logic to the Corinthians' positions.
The Collaborative International Dictionary

Logic \Log"ic\, n. [OE. logike, F. logique, L. logica, logice, Gr. logikh` (sc. te`chnh), fr. logiko`s belonging to speaking or reason, fr. lo`gos speech, reason, le`gein to say, speak. See Legend.]

  1. The science or art of exact reasoning, or of pure and formal thought, or of the laws according to which the processes of pure thinking should be conducted; the science of the formation and application of general notions; the science of generalization, judgment, classification, reasoning, and systematic arrangement; the science of correct reasoning.

    Logic is the science of the laws of thought, as thought; that is, of the necessary conditions to which thought, considered in itself, is subject.
    --Sir W. Hamilton.

    Note: Logic is distinguished as pure and applied. ``Pure logic is a science of the form, or of the formal laws, of thinking, and not of the matter. Applied logic teaches the application of the forms of thinking to those objects about which men do think.''
    --Abp. Thomson.

  2. A treatise on logic; as, Mill's Logic.

  3. correct reasoning; as, I can't see any logic in his argument; also, sound judgment; as, the logic of surrender was uncontestable.

  4. The path of reasoning used in any specific argument; as, his logic was irrefutable.

  5. (Electronics, Computers) A function of an electrical circuit (called a gate) that mimics certain elementary binary logical operations on electrical signals, such as AND, OR, or NOT; as, a logic circuit; the arithmetic and logic unit.

Douglas Harper's Etymology Dictionary

mid-14c., "branch of philosophy that treats of forms of thinking," from Old French logique (13c.), from Latin (ars) logica, from Greek logike (techne) "reasoning (art)," from fem. of logikos "pertaining to speaking or reasoning," from logos "reason, idea, word" (see logos). Meaning "logical argumentation" is from c.1600.

  1. logical n. 1 (context uncountable English) A method of human thought that involves thinking in a linear, step-by-step manner about how a problem can be solved. Logic is the basis of many principles including the scientific method. 2 (context philosophy logic English) The study of the principles and criteria of valid inference and demonstration. 3 (context uncountable mathematics English) The mathematical study of relationships between rigorously defined concepts and of proof of statements. 4 (context countable mathematics English) A formal or informal language together with a deductive system or a model theory semantics. 5 (context uncountable English) Any system of thought, whether rigorous and productive or not, especially one associated with a particular person. 6 (context uncountable English) The part of a system (usually electronic) that performs the boolean logic operations, short for logic gates or logic circuit. v

  2. 1 (context intransitive pejorative English) To engage in excessive or inappropriate application of logi

  3. 2 (context transitive English) To apply logical reasoning to. 3 (context transitive English) To overcome by logical argument.

  1. n. the branch of philosophy that analyzes inference

  2. reasoned and reasonable judgment; "it made a certain kind of logic"

  3. the principles that guide reasoning within a given field or situation; "economic logic requires it"; "by the logic of war"

  4. a system of reasoning [syn: logical system, system of logic]

Logic (disambiguation)

Logic may refer to:

  • Logic, the study of the principles and criteria of valid inference and demonstration
    • Mathematical logic, a branch of mathematics that grew out of symbolic logic
    • Philosophical logic, the application of formal logic to philosophical problems

Logic may also refer to:

Logic (song)

"Logic" is a song by Australian band Operator Please. It is the first single released from the band's second album, Gloves. The song's official release was on 16 February 2010.

Logic (musician)

Sir Robert Bryson Hall II (born January 22, 1990), known by his stage name Logic, is an American rapper, singer, songwriter, and record producer. Raised in Gaithersburg, Maryland, Logic expressed an interest in music as a teenager, and ventured into a musical career in early 2009, releasing a mixtape titled Young, Broke & Infamous, in 2010. He would then sign with Visionary Music Group, before releasing two more mixtapes over two years, which amassed Logic nationwide attention by 2012.

Logic went on to release his fourth mixtape Young Sinatra: Welcome to Forever in 2013, to critical acclaim. Following the mixtape, it was announced that Logic secured a recording contract with Def Jam Recordings and his debut studio album Under Pressure was released in October 2014 to critical success. The record was preceded by the single "Under Pressure" and the album debuted at number four on the U.S. Billboard 200 chart; it was later confirmed to have sold more than 171,000 copies by the Recording Industry Association of America (RIAA).

Logic's second studio album The Incredible True Story was released in November 2015 to critical and commercial success, with critics praising Logic's involvement in the production of the album, his introspective lyricism, and flexibility as a hip hop artist, calling it Logic's best album to date. It was later confirmed to have sold over 185,000 copies in the United States. Logic soon released Bobby Tarantino in 2016. It is his fifth mixtape and the first since Young Sinatra: Welcome to Forever.

LOGIC (electronic cigarette)

LOGIC is an electronic cigarette developed by Logic Technology Development. The electronic cigarette currently holds a 20% market share in U.S. convenience stores. The nicotine is delivered by polyethylene glycol or propolene glycol solution and other additives such as glycerine and flavorings. Propylene glycol is considered to be safe by the FDA for use in food, health and cosmetic products.

In April 2015, Japan Tobacco International agreed to acquire Logic Technology Development.


Logic (from the ) originally meaning the word, or what is spoken, (but coming to mean thought or reason) is generally held to consist of the systematic study of the form of arguments. A valid argument is one where there is a specific relation of logical support between the assumptions of the argument and its conclusion. (In ordinary discourse, the conclusion of such an argument may be signified by words like 'therefore', 'hence', 'ergo' and so on.)

There is no universal agreement as to the exact scope and subject matter of logic (see 'Rival conceptions of logic', below), but it has traditionally included the classification of arguments, the systematic exposition of the 'logical form' common to all valid arguments, and the study of fallacies and paradoxes. Historically, logic has been studied in philosophy (since ancient times) and mathematics (since the mid-1800s), and recently logic has been studied in computer science, linguistics, psychology, and other fields.

Usage examples of "logic".

Because to do so would have been to admit acausal relationships in the Balkans, influences removed from logic which would have been highly confusing in their disorderly ramifications, and had therefore always been thoughtfully ignored as nonexistent.

When confronted with a problem, he has generally reacted with aggression and justified his offensives with distortions and convoluted logic.

Within the dark glistening of the corridors, where surface speaks to surface in tiny whispers like fingers, and the larger codes, the extirpated skeletons of a billion minds, clack together in a cemetery of logic, shaking hands, continually shaking bony, algorithmic hands and observing strict and necessary protocol for the purposes of destruction.

An argumentum ad logic am a brilliant caricature, plausible-sounding and laced with shards of the truth.

The immanent production of subjectivity in the society of control corresponds to the axiomatic logic of capital, and their resemblance indicates a new and more complete compatibility between sovereignty and capital.

His photographs of sexual acts, of sections of automobile radiator grilles and instrument panels, conjunctions between elbow and chromium window-sill, vulva and instrument binnacle, summed up the possibilities of a new logic created by these multiplying artefacts, the codes of a new marriage of sensation and possibility.

Stuart Kauffman, chief scientific officer and co-founder of Cistem Molecular and leading entrepreneur in the developing field of bioinformatics, discusses how computers may be used to determine the circuitry and logic of genes and cells.

Benjy had once told her that human intuition was, in many ways, actually superior to Bolo logic.

PARC technologies never escaped the confines of its copier businessmodel and associated business logic.

The strong internal logic of deep vertical integration, which worked so well for Xerox in the copier and printer business, cast a long shadow over the computer technologies developed at PARC.

The excellent doctor, who was in no way a philosopher, made me study the logic of the Peripatetics, and the cosmography of the ancient system of Ptolemy, at which I would laugh, teasing the poor doctor with theorems to which he could find no answer.

Her logic was better than that of Cicero in his Tusculan Disputations, but she admitted that such lasting felicity could exist only between two beings who lived together, and loved each other with constant affection, healthy in mind and in body, enlightened, sufficiently rich, similar in tastes, in disposition, and in temperament.

He smiled cynically at the moral height to which his logic thus pointed the way.

This is called the Quantification of the Predicate, and leads to some modifications of Deductive Logic which will be referred to hereafter.

If, indeed, the value of Logical systems were to be judged of by the results obtainable, formal deductive Logic would probably be superseded.