Suomi UK /ˈswɔːmɪ/US /ˈswɔmi/ noun3 •Finland (a country in Northern Europe). •[plural only] The Finns.Over and above the 1,800,000 odd they number in Finland, the Suomi come in for about 250,000 more in the population of the adjacent Russian governments. — 1893 •A freeform variation of psytrance music said to originate in Finland, where it is called suomisaundi.