Synonyms: certification, authentication
Definition: validating the authenticity of something or someone
Similar words: substantiation, validation, proof
Definition: the act of validating; finding or testing the truth of something
Synonyms: assay-mark, authentication, hallmark
Definition: a mark on an article of trade to indicate its origin and authenticity
Similar words: mark, marker, marking
Definition: a distinguishing symbol
Usage: the owner's mark was on all the sheep