logic Definition

logic
noun

1a. philos.
The exploration of the validity or otherwise of arguments and reasoning, where the aim is not to prove or disprove the legitimacy of statements or premisses, but rather to show that the underlying thinking behind what is being proposed is well-founded. See also fallacy, syllogism;
1b. math.
The analysis of the principles of reasoning on which mathematical systems are based.
2. The rules or reasoning governing a particular subject or activity.

Example: the logic of the absurd
3a. The extent to which someone's reasoning is sound;

Example: I didn't understand his logic ― it was obvious it wouldn't work
Thesaurus: reasoning, rationale, argumentation.
3b. The convincing and compelling force of an argument;

Example: The logic for having exams is dubious
Thesaurus: reason, sense.
3c. Rationalized thinking.

Example: Logic dictated that she shouldn't go
4. The way that a string of related events or facts is interconnected.
5. electronics, computing.
The system underlying the design and operation of computers, comprising elements that perform specified elementary arithmetical functions, using Boolean algebra.
6. An individual, personal or particular way of reasoning.

Example: with child-like logic

Etymology: 14c: from Greek logos word or ratio.