This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of validate.

adj. Declared or made valid.

adj. Having experienced emotional validation.

adj. declared or made legally valid

"He lowered his ERA to 3.73 for the year with one start remaining, again validated his belief he should never have had to sign a minor league deal back in late February."

validated    validates    validating   

change    modify    alter    support    substantiate   

valid    validation    validator   

confirm