1. a formal statement or document that confirms or verifies something is true
2. the act of witnessing or providing evidence for something

Examples

• The lawyer provided an attestation of the witness’s credibility.
• Her diploma serves as attestation of her educational achievements.
• The notary’s signature was required for attestation of the document.
• The company needed attestation from an auditor before going public.
• His attestation under oath carried significant legal weight.
• The certificate provides attestation that the building meets safety standards.