This is the 606th most frequent Finnish word.
suomalainen
"Suomalainen" means "Finnish" or "Finn" (a Finnish person).
Here, 'suomalainen' is used as a predicate adjective to describe nationality.
Olen suomalainen.
I am Finnish.
'Suomalaisen' acts as an adjective qualifying the noun 'matkailijan' (tourist) and takes the partitive case due to the verb 'Tapasin' (met).
Tapasin suomalaisen matkailijan torilla.
I met a Finnish tourist at the market square.
'Suomalaisen' serves as an adjective describing 'kulttuurin' (culture) in the genitive case to indicate possession or association.