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The Finnish language is suomi (Finnish) or suomen kieli (Finnish language) in Finnish.
Language is kieli in Finnish.
"Kiitos" is a word in the Finnish language, and it means "thank you."
Olli Nuutinen has written:
'Sano minun sanoneen' -- subject(s): Conversation and phrase books, Swedish, Swedish language, Finnish language, Finnish
'Hetkisen pituus' -- subject(s): Finnish language, Language and languages
'Finnish in Finnish'
The language is Finnish, a person from Finland is called a Finn.