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English definition of “run of site”

run of site

adjective (also run-of-site)     (abbreviation ROS) MARKETING, E-COMMERCE
used to describe advertising space on a website, bought at a rate that does not allow the business buying the space to choose a particular place for their advertisement: A run of site ad rotates on all non-featured ad spaces on a site.
(Definition of run of site adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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