5vuotinen

5vuotinen is a Finnish compound adjective used to describe something that lasts five years or has a duration of five years. In standard Finnish it is usually written as viidenvuotinen when the number is expressed as a word; when digits are used, the form 5-vuotinen with a hyphen is common. The term does not refer to age; for people, five years of age is described as viisivuotias.

Formation and usage: The word is formed from viisi in the genitive viiden and the suffix vuotinen, which turns the combination into an adjective describing a noun. It typically modifies a noun indicating a period, contract, plan, or other time span. Examples: viidenvuotinen sopimus (a five-year contract), viidenvuotinen suunnitelma (a five-year plan), viidenvuotinen jakso (a five-year period). Inflection examples include nominative viidenvuotinen, genitive viidenvuotisen, and partitive viidenvuotista.

Orthographic notes: When using digits, it is common to hyphenate the numeral, producing 5-vuotinen. With spelled numbers, the one-word form viidenvuotinen is standard in many contexts. Some style guides prefer viidenvuotinen over 5-vuotinen in formal writing, while media texts frequently use 5-vuotinen for brevity and readability.

See also: The related expressions viiden vuoden mittainen and other numeral-based descriptors, which convey similar meaning with slightly different emphasis or formality.