validate
val-i-date
verb
To recognise and affirm the value or legitimacy of someone's feelings or experiences.
"It's crucial to validate a child's emotions."
verb
To confirm the truth, accuracy, or legality of something, making it officially acceptable.
"The system will validate your login credentials."
Thesaurus
Synonyms: corroborate, formalise, formalize
Antonyms: annul, avoid, invalidate, nullify, quash, vitiate, void