logic
log·ic / ˈläjik/ • n. 1. reasoning conducted or assessed according to strict principles of validity: experience is a better guide to this than deductive logic he explains his move with simple logic the logic of the argument is faulty. ∎ a particular system or codification of the principles of proof and inference: Aristotelian logic. ∎ the systematic use of symbolic and mathematical techniques to determine the forms of valid deductive argument. ∎ the quality of being justifiable by reason: there's no logic in telling her not to hit people when that's what you're doing. ∎ (logic of) the course of action or line of reasoning suggested or made necessary by: if the logic of capital is allowed to determine events.2. a system or set of principles underlying the arrangements of elements in a computer or electronic device so as to perform a specified task. ∎ logical operations collectively.DERIVATIVES: lo·gi·cian / ləˈjishən; lō-/ n.