kuukausittaisia

Kuukausittaisia is the plural partitive form of the Finnish adjective kuukausittainen, meaning "monthly." It is used to describe multiple nouns in the partitive case and often refers to items that recur on a month-by-month basis rather than being counted as discrete units. In practice, kuukausittaisia describes monthly occurrences, figures, or items attached to a timeframe of months.

Common usage includes contexts such as finance, statistics, and scheduling. For example, kuukausittaisia tuloja means monthly incomes, kuukausittaisia laskuja means monthly invoices, and kuukausittaisia raportteja means monthly reports. Because it is an adjective in its plural partitive form, kuukausittaisia always accompanies a plural noun in a partitive or indefinite sense.

The form is derived from kuukausi (month) with the adjectival suffix -ttainen, which yields kuukausittainen meaning "monthly." The plural partitive ending -isia marks the form used with plural nouns in the partitive case, for example when the quantity or occurrence is not fully specified or is viewed as a general set rather than as a fixed, countable group.

Related forms include kuukausittainen (singular nominative) and the adverb kuukausittain, which means "monthly" as an adverb rather than as an adjective. Kuukausittaisia thus serves a specific grammatical role in Finnish to express monthly characteristics of plural items in a non-specified quantity. See also related terms for other time-based frequencies, such as viikoittaisia (weekly) and vuosittaisia (annual).