Dictionary > English Dictionary > Definition, synonym and antonym of logic
Meaning of logic by Wiktionary Dictionary


    Alternative forms


    From Old French logike, from Latin logica, from Ancient Greek λογική ( logike, “logic” ), from properly feminine of λογικός ( logikós, “of or pertaining to speech or reason or reasoning, rational, reasonable” ), from λόγος ( logos, “speech, reason” ) .


    • ( RP ) enPR: lŏj'ĭk, IPA: /ˈlɒdʒɪk/, X-SAMPA: /"lQdZIk/
    • ( US ) enPR: lŏj'ĭk, IPA: /ˈlɑːdʒɪk/, X-SAMPA: /"lA:dZIk/
    • Rhymes: -ɒdʒɪk



    1. logical


    logic ( countable and uncountable; plural: logics )

    1. ( uncountable ) 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. ( philosophy, logic ) The study of the principles and criteria of valid inference and demonstration.
    3. ( uncountable ) ( mathematics ) The mathematical study of relationships between rigorously defined concepts and of proof of statements .
    4. ( countable ) ( mathematics ) A formal or informal language together with a deductive system or a model-theoretic semantics .
    5. ( uncountable ) Any system of thought, whether rigorous and productive or not, especially one associated with a particular person .
      It's hard to work out his system of logic .
    6. ( uncountable ) The part of an electronic system that performs the boolean logic operations, short for logic gates or logic circuit .
      Fred is designing the logic for the new controller .


    Related terms


    logic ( third-person singular simple present logics, present participle logicking, simple past and past participle logicked )

    1. ( intransitive, pejorative ) To engage in excessive or inappropriate application of logic.
    2. ( transitive ) To apply logical reasoning to.
    3. ( transitive ) To overcome by logical argument.

    External links

    • logic in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
    • logic in The Century Dictionary, The Century Co., New York, 1911
    • logic at OneLook Dictionary Search


    By Wiktionary ( 2010/01/27 12:52 UTC Version )



    1. -logical .

Explanation of logic by Wordnet Dictionary


    1. reasoned and reasonable judgment

    2. it made a certain kind of logic
    3. a system of reasoning

    4. the principles that guide reasoning within a given field or situation

    5. economic logic requires it
      by the logic of war
    6. the system of operations performed by a computer that underlies the machine's representation of logical operations

    7. the branch of philosophy that analyzes inference

    Definition of logic by GCIDE Dictionary


    1. Logic n. [OE. logike, F. logique, L. logica, logice, Gr. λογική ( sc. τέχνη ), fr. λογικός belonging to speaking or reason, fr. λόγος speech, reason, λέγειν 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.

      ☞ 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”.