olemus
ISO 5127:
trüki (hoolikas) proovijäljend
= trial or extra careful impression of a print

ISO 12637, ISO/TR 19300:
paber- või elektronreproduktsioon kavatsetava trükkväljastise
simuleerimiseks
= hard or soft copy reproduction made using various technologies to simulate an intended printing output

Wiktionary:
6. (countable, printing) A proof sheet; a trial impression, as from type, taken for correction or examination.

vt ka
https://en.wikipedia.org/wiki/Artist%27s_proof

https://en.wikipedia.org/wiki/Galley_proof

https://en.wikipedia.org/wiki/Prepress_proofing