attestation (n.)

• admission
• affidavit
• affirmation
• allegation
• assertion
• asseveration
• authentication
• authority
• authorization
• averment
• avouchment
• avowal
• backing
• buttressing
• certificate
• certification
• confirmation
• corroboration
• credential
• declaration
• deposition
• diploma
• disclosure
• documentation
• evidence
• fortification
• note
• profession
• proof
• proving
• ratification
• reinforcement
• sheepskin
• statement
• strengthening
• substantiation
• support
• swearing
• testament
• testimonial
• testimony
• ticket
• validation
• verification
• visa
• vise
• voucher
• warrant
• warranty
• witness
• word