attestation

Concise Oxford English Dictionary © 2008 Oxford University Press:
attest /əˈtɛst/

▶verb

• 1 provide or serve as clear evidence of.

• 2 declare that something exists or is the case.

– derivatives
attestable adjective,
attestation noun,
attestor noun.

– origin C16 (earlier (ME) as attestation): from Fr. attester, from L. attestari, from ad- ‘to’ + testari ‘to witness’.