Dictionary and Thesaurus

Definition of Invalidate

• (v. t.) To render invalid; to weaken or lessen the force of; to destroy the authority of; to render of no force or effect; to overthrow; as, to invalidate an agreement or argument.

Synonyms of Invalidate

• Annul
• Quash
• Void
• Avoid
• Nullify
• Cancel
• Nullify
• Void
• Vitiate

Antonyms of Invalidate

• Validate
• Validate
• Validate

Homophones of Invalidate