The act of jointly attesting to something; combined or shared witnessing of the truth or authenticity of something.
Prefix 'co-' (Latin 'cum') + 'attestation' (from Latin 'attestatio' meaning 'bearing witness'). Legal/formal terminology that emerged in modern English.
Legal English has tons of 'co-' words—'coattestation,' 'cosigner,' 'codefendant'—because the law often requires shared responsibility and joint testimony to protect everyone involved!
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