View synonyms for logic



[ loj-ik ]


  1. the science that investigates the principles governing correct or reliable inference.
  2. a particular method of reasoning or argumentation:

    We were unable to follow his logic.

  3. the system or principles of reasoning applicable to any branch of knowledge or study.
  4. reason or sound judgment, as in utterances or actions:

    There wasn't much logic in her move.

    Synonyms: cogency, sense

  5. convincing forcefulness; inexorable truth or persuasiveness:

    the irresistible logic of the facts.

  6. Computers. logic circuit.


  1. a combining form used in the formation of adjectives corresponding to nouns ending in -logy:



/ ˈlɒdʒɪk /


  1. the branch of philosophy concerned with analysing the patterns of reasoning by which a conclusion is properly drawn from a set of premises, without reference to meaning or context See also formal logic deduction induction
  2. any particular formal system in which are defined axioms and rules of inference Compare formal system formal language
  3. the system and principles of reasoning used in a specific field of study
  4. a particular method of argument or reasoning
  5. force or effectiveness in argument or dispute
  6. reasoned thought or argument, as distinguished from irrationality
  7. the relationship and interdependence of a series of events, facts, etc
  8. chop logic
    chop logic to use excessively subtle or involved logic or argument
  9. electronics computing
    1. the principles underlying the units in a computer system that perform arithmetical and logical operations See also logic circuit
    2. ( as modifier )

      a logic element


/ lŏjĭk /

  1. The study of the principles of reasoning, especially of the structure of propositions as distinguished from their content and of method and validity in deductive reasoning.


  1. The branch of philosophy dealing with the principles of reasoning. Classical logic, as taught in ancient Greece and Rome , systematized rules for deduction . The modern scientific and philosophical logic of deduction has become closely allied to mathematics , especially in showing how the foundations of mathematics lie in logic.

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Other Words From

  • logic·less adjective
  • non·logic noun

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Word History and Origins

Origin of logic1

First recorded in 1325–75; Middle English logik, from Latin logica, noun use of neuter plural (in Medieval Latin taken as feminine singular) of Greek logikós “of speech or reason”; logo-, -ic

Origin of logic2

< Greek -logikós. See logic

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Word History and Origins

Origin of logic1

C14: from Old French logique from Medieval Latin logica (neuter plural, treated in Medieval Latin as feminine singular), from Greek logikos concerning speech or reasoning

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Example Sentences

Their logic: the sea-creature would come alive and drink up any remaining alcohol.

The birds will seek us out and they will use no logic we know.

Kim Novak's heavy legs were concealed and all logic left on the cutting room floor.

This came across in the Showtime Omit the Logic documentary—in which you were a commentator—and it comes across here.

There was a logic to it – many of the wines were from the Pacific Northwest, principally from Oregon and Washington state.

You may say, in the case of Sikes and the peer, that the logic of the Determinist is sound, but ineffective: nothing comes of it.

Mr. Ripper's logic tended to the belief that he could not be punished if he stuck to the avowal of having seen nothing.

We thought pursuit had long been abandoned, but they are driven by single-minded hate, not by logic.

By what strange logic do they decide that a thing can not fail to happen because they ardently desire it to happen?

Her resentment of that undermined all the fairness of her logic, and even triumphed over the sword of her suspense.


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Words That Use -logic

What does -logic mean?

The combining form -logic is used like a suffix meaning “of or relating to a body of knowledge or writing.” In some rare instances, such as dialogic, -logic means “of or relating to a word or discourse,” as in dialogic. It is occasionally used in scientific and technical terms.

The form -logic comes from Greek -logikós, meaning “of speech or reason,” which is derived from logos, meaning “word” or “discourse.” To learn more about logos, you can read our entry on the English word logos here.

What are variants of -logic?

Though it doesn’t have any variants, the suffix -logic is related to the combining form -logy, which is used to form nouns related to adjectives that end in -logic, as in ecology. Additional related forms include -log and -logue. Want to know more? Read our Words That Use articles on all three forms.

Examples of -logic

One example of a scientific term that features the form -logic is lithologic, “of or relating to the study of rocks.”

The form litho- means “rock,” from Greek líthos. As we have already seen, -logic means “of or relating to a body of knowledge.” Lithologic translates to “of or relating to the study of rocks.”

What are some words that use the combining form -logic?

What are some other forms that -logic may be commonly confused with?

Break it down!

The combining form cosmo- means “universe.” With this in mind, what does cosmologic mean?

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