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English definition of “run of book”

run of book

adjective (also run-of-book)     ( abbreviation ROB) MARKETING
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
(Definition of run of book adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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