kuukausittaisina

Kuukausittaisina is a Finnish inflected form of the adjective kuukausittainen, meaning monthly. It is the plural essive form, used to describe a group of nouns as existing in or occurring in a monthly form or on a monthly basis. In Finnish grammar, the essive case expresses a temporary state or role, and the plural essive is used with plural nouns. The form kuukausittaisina is formed by taking the stem kuukausittainen and adding the plural essive ending -isina.

Usage and context include formal and descriptive writing, such as reports, planning documents, budgets, and schedules, where one needs to refer to recurring monthly phenomena affecting multiple items or categories. The plural essive form is typically found with a plural noun in the sentence, functioning similarly to “as monthly ones” or “in the monthly form” in English. For adverbial meaning, Finnish normally uses kuukausittain, which is a separate, adverbial form.

Relation to related forms: kuukausittainen is the basic adjective meaning “monthly,” used before a singular noun. Kuukausittaisina serves when the writer needs to describe several things in the monthly category in a predicative or attributive sense, coexisting with other plural nouns in the essive case.

See also: kuukausittain, kuukausittainen, Finnish grammar notes on the essive case.