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Definition of logic : 1. A treatise on logic; as, Mill's Logic.
2. 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; correct reasoning.

Synonyms:

ratiocination, rationality, system of logic, logical system, rationale, sense, rationalness

conceptualization, brain work, thinking, induction, synthesis, inference, cogitation, reason, deduction, analysis, thought

dialectic, antithesis and synthesis, experimental, pragmatic, philosophy, modern, chain of reasoning, mathematical, psychological, Baconian, Aristotelian, epistemological, Ramistic, deductive, syllogism, inductive, Ramist, symbolic, course of argument, course of thought thesis, formal, instrumental

Usage examples:

• What logic, in heaven's name? - "Zibeline, Complete", Phillipe de Massa Last Updated: March 2, 2009.
• It ought not to be, as it is contrary to logic, and to human events. - "Diary from March 4, 1861, to November 12, 1862", Adam Gurowski.
• A very lucid though closely reasoned outline of the logic of good conduct. - "Chaucer and His Times", Grace E. Hadow.