/ əˈtest; NAmE / verb ( formal )
1.
attest (to sth) to show or prove that sth is true
SYN bear witness to :
[ v ]
Contemporary accounts attest to his courage and determination.
[also v that , vn ]
2.
to state that you believe that sth is true or genuine, for example in court :
[ vn ]
to attest a will
The signature was attested by two witnesses.
[also v that ]
••
WORD ORIGIN
early 16th cent.: from French attester , from Latin attestari , from ad- to + testari to witness (from testis a witness).