* To make something no longer valid or acceptable:
* "The new evidence invalidated the original theory."
* "The expired passport invalidated her travel plans."
* To show that something is false or wrong:
* "The witness's testimony invalidated the defendant's alibi."
* "The recent study invalidated the previous research findings."
* To make something powerless or ineffective:
* "The doctor's diagnosis invalidated the need for further testing."
* "The company's poor financial performance invalidated their previous claims of success."
Example sentences in different contexts:
* Formal: "The judge's ruling invalidated the contract due to a breach of agreement."
* Informal: "That new rumor totally invalidated everything we thought we knew about the situation."
* Technical: "The software update invalidated the existing user profiles."
Remember that "invalidate" usually implies a negative consequence, making something no longer valid or effective.