[at.test] vb [MF attester, fr. L attestari, fr. ad- + testis witness--more at testament] vt (1596) 1 a: to affirm to be true or genuine; specif: to authenticate by signing as a witness b: to authenticate officially
2: to establish or verify the usage of
3: to be proof of: manifest "her record ~s her integrity"
4: to put on oath ~ vi: to bear witness: testify "~ to a belief" syn see certify -- at.tes.ta.tion n -- at.test.er n