transitive verb. : to make invalid especially : to weaken or destroy the cogency of. Other Words from invalidate Synonyms Choose the Right Synonym Example Sentences Learn More About invalidate.

What does it mean by invalidate?

noun. an infirm or sickly person. a person who is too sick or weak to care for himself or herself: My father was an invalid the last ten years of his life.

What does invalidate mean example?

If administrators find out that students cheated on a test, the school might invalidate their class grades. To invalidate means to cancel something or make it void, as if it never happened. ... When you invalidate something you are making it less true, less official, or less correct.