logic
/ˈlɒdʒɪk/
Noun
1
The systematic study of the principles of valid reasoning and inference.
She studied logic and philosophy at university.
2
A particular system or method of reasoning.
The logic of scientific inquiry requires careful observation and testing.
3
Sound reasoning or good sense; the quality of being reasonable or sensible.
There's no logic in spending money you don't have.
4
The principles that govern the operation of a computer or electronic circuit.
The logic in this circuit controls the flow of data.