attest
at.test \*-'test\ \.a-.tes-'ta--sh*n, .at-*-'sta--\ vb [MF attester, fr. L attestari, fr. ad- + testis witness] - more at TESTAMENT 1a: to affirm to be true or genuine; specif : to authenticate by s igning as a witness 1b: to authenticate officially 2: to establish or verify the usage of 3: to be proof of MANIFEST 4: to put on oath : to bear witness : TESTIFY - at.tes.ta.tion n