" attestation "

1: something presented in support of the truth or accuracy of a claim;

  * e.g., " ... the fact that he spent hours standing in line for the sequel should be attestation enough that he's a die-hard fan of the movie series "

•  Synonyms : 

•  confirmation,

•  corroboration,

•  documentation,

•  evidence,

•  proof,

•  substantiation,

•  testament,

•  testimonial,

•  testimony,

•  validation,

•  voucher,

•  witness

•  Antonyms : 

•  disproof

1: to declare (something) to be true or genuine;

  * e.g., " ... the appraiser attests that the lamp is indeed an original Tiffany "

•  Synonyms : 

•  authenticate,

•  avouch,

•  certify,

•  testify (to),

•  vouch (for),

•  witness

•  Antonyms : 

•  disprove,

•  rebut,

•  refute

2: to make a solemn declaration under oath for the purpose of establishing a fact;

  * e.g., " ... an eyewitness who will attest to my innocence "

•  Synonyms : 

•  depose,

•  swear,

•  testify,

•  witness

•  Antonyms : 

• (N/A)

3: to give evidence or testimony to the truth or factualness of;

  * e.g., " ... I'll attest that she was at the party "

•  Synonyms : 

•  argue,

•  authenticate,

•  bear out,

•  certify,

•  confirm,

•  corroborate,

•  substantiate,

•  support,

•  validate,

•  verify,

•  vindicate

•  Antonyms : 

• (N/A)