This is the 14th most frequent Finnish word.
vuonna
"In the year."
The word 'vuonna' is used here as a preposition to indicate the specific year in which the event occurred. It can be roughly translated to 'in the year' in English.
Synnyin vuonna 1990.
I was born in the year 1990.
The usage of 'vuonna' in this sentence pinpoints a future year when a planned activity will take place.
Vuonna 2025 aiomme matkustaa Japaniin.
In the year 2025, we plan to travel to Japan.
Here, 'vuonna' serves to specify the occurrence of an important historical event tied to a specific year.