Webster's English Dictionary

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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