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run of book

(also run-of-book)
 
 
adjective (abbreviation ROB) MARKETING

Definition

used to describe advertising space in a magazine, newspaper, etc. bought at a rate that does not allow the business buying the space to choose a particular place for their advertisement: An advertiser decided to turn two run of book pages into an insert. Could you provide me with the gross rate for a run-of-book ad?
run-of-book adverb The offer includes one full page four-color ad to be placed run-of-book.
(Definition of run of book adjective from the Cambridge Business English Dictionary © Cambridge University Press)

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