term:

Attest

attest vb

[Latin attestari, from ad to + testari to call to witness, from testis witness]
vt
: to bear witness to
: affirm to be true or genuine
;specif
: to authenticate (as a will) by signing as a witness
vi
: to bear witness
: testify often used with to
at·tes·ta·tion [a-tes-tā-shən]
n

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.