kesiään
Kesiään is a Finnish word that translates to "their summer" or "summers" depending on the context and grammatical case. It is the genitive, dative, or accusative singular form of the possessive suffix -nsä, when applied to the third person plural pronoun "he" (they). This suffix is attached to the noun indicating the summer. Therefore, "kesiään" literally means "their summer" in a possessive sense.
For example, in the sentence "Lapset nauttivat kesiään," which translates to "The children enjoyed their summer,"