Definitions
1.nounA thing that serves to bear witness, confirm, or authenticate; validation, verification, documentation.
2.nounA confirmation or authentication.
3.nounThe process, performed by accountants or auditors, of providing independent opinion on published financial and other business information of a business, public agency, or other organization.
4.noun(of a language, word, word form, or word meaning) An appearance in print or otherwise recorded on a permanent medium.