Definition of: logic

(loj′ik) noun
1. The normative science which investigates the principles of valid reasoning and correct inference, either from the general to the particular, deductive logic; or from the particular to the general, inductive logic. Compare FORMAL LOGIC, SYMBOLIC LOGIC.
2. The basic principles of reasoning developed by and applicable to any field of knowledge: the logic of science.
3. Effective or convincing force: The logic of his argument is unassailable.
4. The system of thought or ideas governing conduct, belief, behavior, etc.: the logic of business enterprise. [<F logique <L logica <Gk. logikē (technē) logical (art) <logikos of speaking or reason <logos word, speech, thought]