proof
proof
noun
A trial impression of a page or photograph for correction before final printing.
"The editor checked the page proofs carefully."
verb
To make something resistant to a particular substance or condition.
"They proofed the fabric against water."
noun
Evidence or argument establishing a fact or truth beyond doubt.
"There is no proof of his guilt."
Thesaurus
Synonyms: trial impression, test copy, proofread, cogent evidence, substantiation, validation