1. a person who attests or bears witness to something; one who provides attestation
Usage: formal or legal context; less common than 'attestor' or 'witness'

Examples

• The attestant signed the document to confirm its authenticity.
• Multiple attestants were required to verify the signature on the will.
• As an attestant, she was called to testify about what she had witnessed.
• The contract needed at least two attestants to be legally binding.
• The attestant's credibility was questioned during the trial.