WordWeb Online

1. Established as genuine
   "Governments and organizations sometimes require that foreign documents be authenticated before they will accept them";
   - attested, documented

1. Establish the authenticity of something
   "You should authenticate a buddy the very first time that you talk to them using off-the-record messaging"

See also: echt, genuine

Type of: attest, certify, demonstrate, evidence, manifest

Encyclopedia: Authenticated