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This article addresses the theme of mediations in a multidimensional way - vertical, institutional and horizontal mediation - and presents how these dimensions have been addressed in Information Science (CI) and Library Science and related areas (Archival Science, Museology and Information Systems) in publications in Portuguese. At first, the mediation concept is presented in its different manifestations, privileging its horizontal and vertical axis. Then, it was undertaken a panoramic study on abstracts of full articles published about that theme in 11 LIS, six Museology, two Archival Science and one Information Systems Journals, in the last ten years (articles published from january 2007 to October 2017). Through content analysis of those abstracts, it is possible to affirm the great variety of concepts and approaches of mediation. The general mediation concept is wide and generic, and has been approached in LIS and Museology, in reference as to macrosocial processes about the role of museums and library in social order, covering cultural actions, as to institutional process related do document organizing, and also situational processes related to educative actions and services offered to users and publics. By their turn, Archival Science Journals modestly present the theme, which one is almost absent in Information System Journals. [ABSTRACT FROM AUTHOR]