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Meaning of galley proof

gal'ley proof"

Pronunciation: [key]
— Print. Print.
  1. a proof, originally one set from type in a galley, taken before the material has been made up into pages and usually printed as a single column of type with wide margins for marking corrections.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.