Selityksin

Selityksin is a Finnish noun form. It is the instrumental plural of selitys, meaning "explanation." The form expresses means or method—roughly "with explanations" or "by explanations"—and is used to indicate that something is done or presented with those explanations.

In modern Finnish, selityksin is relatively rare and tends to appear in older or more literary texts. It is formed by adding the instrumental plural suffix -in to the stem of selitys, producing a phrase that functions as a modifier or determinant of other nouns.

Common usages include compounds such as selityksin varustettu oppikirja ("an instructional book furnished with explanations") and selityksin laaditut muistiinpanot ("notes prepared with explanations"). The form signals a formal or explanatory framing and may sound archaic in everyday prose.

See also: selitys; Finnish grammar; instrumental case; comitative.