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