certification (n.)

• acceptance
• affidavit
• affirmation
• approbation
• approval
• assurance
• attestation
• authentication
• authority
• authorization
• backing
• buttressing
• certificate
• check
• clearance
• collation
• confirmation
• corroboration
• countenance
• countersignature
• credential
• deposition
• determination
• diploma
• documentation
• empowerment
• endorsement
• enfranchisement
• entitlement
• establishment
• fiat
• fortification
• go-ahead
• imprimatur
• nod
• note
• okay
• permission
• proof
• proving
• ratification
• reassurance
• reinforcement
• sanction
• seal
• sheepskin
• signature
• signet
• stamp
• strengthening
• subscription
• substantiation
• support
• swearing
• testimonial
• testimony
• ticket
• validation
• verification
• visa
• vise
• voucher
• warrant
• warranty
• witness