1. certification, enfranchisement, authorization, authorisation, empowerment

usage: the act of certifying or bestowing a franchise on

2. documentation, certification, corroboration, confirmation

usage: confirmation that some fact or statement is true through the use of documentary evidence

3. certificate, certification, credential, credentials, document, written document, papers

usage: a document attesting to the truth of certain stated facts

4. authentication, certification, validation, proof, substantiation

usage: validating the authenticity of something or someone

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See also: certification (Dictionary)