What is the opposite of invalidates?

Need antonyms for invalidates? Here's a list of opposite words from our thesaurus that you can use instead.

Verb
To act on, or put into action, a request
“He quickly actions any instructions as soon as they are provided to him.”
Verb
To establish a fact to be true
“Recent data shows that unemployment has fallen to record lows.”
Verb
Opposite of to put an end to, especially formally
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