logic

¹

[ loj-ik ]

noun

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.

-logic

²

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

   analogic.

logic

/ ˈlɒdʒɪk /

noun

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
   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

logic

/ lŏj′ĭk /

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.

logic

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.

Other Words From

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

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

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

Example Sentences

The reason cited is illegal construction but experts have questioned the logic and say there is no legal justification for doing this.

From BBC

It’s the kind of upside-down logic commonly found in abusive relationships, whenever the abuser is challenged.

From Salon

Certainly not, but political decisions are driven by emotion and narrative, not instrumental logic.

From Salon

They voted for Trump, many of them, because it was the best way to vote against diversity and tolerance, logic and reason, cities and universities, you and me.

From Slate

Eventually, most Americans will internalize the cultural logic of Trumpism and fascism and begin to self-police and conform — and enforce the new order against their family members, friends, neighbors, and strangers.

From Salon

Related Words

• philosophy
• rationale
• sanity
• sense