to prove that something is true or correct, or to make a document or agreement officially and legally acceptable [= confirm]:
The Supreme Court has validated the lower court's interpretation of the law.
Many scientists plan to wait until the results of the study are validated by future research.
to make someone feel that their ideas and feelings are respected and considered seriously:
Talking with people who think like you helps validate your feelings.
3 American English
if a business validates a ticket from a parking garage, it puts a special mark on it, showing that it will pay the parking costs
—validation noun [uncountable and countable]