logic
noun
ˈlɒdʒɪk 
ˈlɑːdʒɪk 
1 [uncountable] a way of thinking or explaining somethingI fail to see the logic behind his argument.The two parts of the plan were governed by the same logic.2 [uncountable, singular] sensible reasons for doing somethingLinking the proposals in a single package did have a certain logic.a strategy based on sound commercial logicThere is no logic to/in any of their claims.3 [uncountable] (philosophy) the science of thinking about or explaining the reason for something using formal methodsthe rules of logic4 [uncountable] (computing) a system or set of principles used in preparing a computer to perform a particular task