What is the meaning of checkout?

noun

• The act of inspecting or verifying.
  • usage: "they made a check of their equipment"; "the pilot ran through the check-out procedure"
  • synonyms: check, check-out procedure
• The latest time for vacating a hotel room.
  • usage: "the checkout here is 12 noon"
  • synonyms: checkout time
• A counter in a supermarket where you pay for your purchases.
  • synonyms: checkout counter