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]
There's a certain logic in/to what he says.
b
: a particular way of thinking about something
I could not understand her logic in keeping the dog. [=I could not understand her reason for keeping the dog]
I fail to see your logic. = I fail to see the logic behind/of your reasoning.
faulty logic
2
: the science that studies the formal processes used in thinking and reasoning
a professor of logic
3
: the way facts or events follow or relate to each other
The revolution proceeded according to its own logic.
the logic of the situation
4
technical
: the arrangement of circuits in a computer
Cite this Entry
“Logic.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/logic. Accessed 30 Jun. 2026.
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