kirjoissaan

The word "kirjoissaan" is a Finnish grammatical form. It is the third-person plural essive case of the word "kirjoitus," which means "writing" or "script." The essive case in Finnish indicates a state or condition. Therefore, "kirjoissaan" translates to "in their writings" or "in their scripts." It is used to refer to something being present or happening within the body of written material belonging to a specific group of people or entities. For example, one might say "Ideat ovat kirjoissaan" meaning "The ideas are in their writings." This grammatical construction is common in Finnish and is used across various contexts when discussing the content of written works.