journalistisissa
Journalistisissa is a Finnish grammatical form and not a standalone concept. It is the inessive plural form of the adjective journalisticinen/journalistinen (journalistinen means “journalistic”). The form is used to describe a plural noun in the inessive case, for example in phrases like journalistisissa artikkeleissa, meaning “in journalistic articles.”
In practical use, journalistisissa modifies plural nouns referring to journalism-related content or practices. Common contexts include
Orthographically, journalistisissa results from combining the stem journalistis- with the inessive plural suffix -ssa/-ssä. The ending
See also: Finnish grammar, adjectives in Finnish, inessive case, linguistic terminology.