1. to make something legally or officially void or without effect
2. to prove that something is false or incorrect

Examples

• The court ruled to invalidate the contract due to fraud.
• A single mistake could invalidate your entire application.
• New evidence may invalidate the original theory.
• The expired signature will invalidate your ballot.
• Scientists worked to invalidate the flawed research.
• Technical errors can invalidate test results.
• The judge decided to invalidate the marriage license.