käyttöönotettujen

Käyttöönotettujen is a Finnish grammatical form derived from the past participle käyttöönotettu, meaning "put into use", "commissioned" or "deployed". Morphologically, käyttöönotettujen is the genitive plural (and also the accusative plural in some syntactic contexts) of this participle-adjective, used to qualify multiple items that have been taken into operation.

The term appears frequently in technical, administrative and organizational contexts. In information technology and engineering it describes systems, devices or software that have been deployed ("käyttöönotettujen laitteiden määrä" — the number of deployed devices). In public administration and law it can refer to measures or procedures that have been implemented. As a compound, the word combines käyttö (use), ottaa (to take) and the past participle suffix -ttu, reflecting the action of bringing something into use.

Common related forms include käyttää (to use), käyttöönotto (noun: commissioning or deployment), ottaa käyttöön (to put into use) and other case variants such as käyttöönotetut (plural nominative) and käyttöönotettuja (partitive plural). In English translations, käyttöönotettujen is usually rendered as "of the deployed/implemented/commissioned [items]" depending on context. Example: käyttöönotettujen järjestelmien ylläpito tarkoittaa "maintenance of the systems that have been put into use."