Learner's definition of LOGIC
1 a : a proper or reasonable way of thinking about or understanding something
If you just use a little logic, you'll see I'm right.
the rules of logic
There's no logic in/to your reasoning.
I can't see the logic in always worrying about the future. = Where's the logic in always worrying about the future?
There's some logic to/in what he says.
She kept the dog, against all logic, after it attacked her. [=her decision to keep the dog was not logical/sensible]
Her decision defies logic. [=her decision makes no sense; her decision is not logical]
[singular] b [noncount] : a particular way of thinking about something
2 [noncount] : the science that studies the formal processes used in thinking and reasoning 3 [noncount] : the way facts or events follow or relate to each other 4 [noncount], technical : the arrangement of circuits in a computer