Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.
  • n. A system of reasoning: Aristotle's logic.
  • n. A mode of reasoning: By that logic, we should sell the company tomorrow.
  • n. The formal, guiding principles of a discipline, school, or science.
  • n. Valid reasoning: Your paper lacks the logic to prove your thesis.
  • n. The relationship between elements and between an element and the whole in a set of objects, individuals, principles, or events: There's a certain logic to the motion of rush-hour traffic.
  • n. Computer Science The nonarithmetic operations performed by a computer, such as sorting, comparing, and matching, that involve yes-no decisions.
  • n. Computer Science Computer circuitry.
  • n. Computer Science Graphic representation of computer circuitry.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. logical
  • n. 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.
  • n. The study of the principles and criteria of valid inference and demonstration.
  • n. (mathematics) The mathematical study of relationships between rigorously defined concepts and of proof of statements.
  • n. (mathematics) A formal or informal language together with a deductive system or a model-theoretic semantics.
  • n. Any system of thought, whether rigorous and productive or not, especially one associated with a particular person.
  • n. The part of a system (usually electronic) that performs the boolean logic operations, short for logic gates or logic circuit.
  • v. To engage in excessive or inappropriate application of logic.
  • v. To apply logical reasoning to.
  • v. To overcome by logical argument.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.
  • n. A treatise on logic.
  • n. correct reasoning; ; also, sound judgment.
  • n. The path of reasoning used in any specific argument.
  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. The science of the distinction of true from false reasoning, with whatever is naturally treated in connection therewith. See the phrases below.
  • n. [Dialectic and organon are generally synonyms of logic, though they have been variously distinguished at different times.]
  • n. Reasoning, or power of reasoning; ratiocination; argumentation; used absolutely, reason; sound sense.
  • n. The science of the necessary rules of thought: also called scientific logic: opposed to natural logic .
  • n. The logical doctrine applicable to natural things: opposed to the logic of faith, which is applicable to supernatural things (a distinction used in discussions on the Trinity).
  • n. An anthropological science which treats of the rules of the natural use of the understanding.
  • n. The logic of objective thought, or thought as it exists in the external world.
  • n. The science which expounds the laws by which our scientific procedure should be governed, so far as these lie in the contents, materials, or objects about which our knowledge is conversant. Also called material logic.
  • Pertaining to God the Son as the Logos or Word of God.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the principles that guide reasoning within a given field or situation
  • n. a system of reasoning
  • n. the branch of philosophy that analyzes inference
  • n. the system of operations performed by a computer that underlies the machine's representation of logical operations
  • n. reasoned and reasonable judgment

Etymologies

Middle English, from Old French logique, from Latin logica, from Greek logikē (tekhnē), (art) of reasoning, logic, feminine of logikos, of reasoning, from logos, reason; see leg- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
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"). (Wiktionary)

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