Synonyms of validation

1 Syllable
nod, proof
2 Syllables
support, whatfor, visa, witness, warrant, assent, okay, accord, consent, proving, sanction, passing
3 Syllables
approval, agreement, supporting, verifying, affirming, sanctioning, admission, passage, testament, avowal, approvals, accepting
4 Syllables
testimonial, affirmation, evidence, recognition, substantiation, endorsement, demonstrations, validating, substantiations, attestation, demonstration, authorizing, acceptance, testimony
5 Syllables
authorization, verification, justifications, sanctification, corroboration, authenticating, corroborating, corroborations, authentications, justification, authentication