What is the meaning of logic?

noun

• The branch of philosophy that analyzes inference.
• Reasoned and reasonable judgment.
  • usage: "it made a certain kind of logic"
• The principles that guide reasoning within a given field or situation.
  • usage: "economic logic requires it"; "by the logic of war"
• The system of operations performed by a computer that underlies the machine's representation of logical operations.
• A system of reasoning.
  • synonyms: logical system, system of logic