This is the 444th most frequent Finnish word.
vuosia
"Vuosia" means "years" (partitive plural form of "vuosi").
In this sentence, 'vuosia' is in the partitive plural form, indicating an ongoing action over unspecified multiple years.
Olen odottanut tätä hetkeä vuosia.
I have been waiting for this moment for years.
Here, 'vuosia' is used to indicate a specific time in the past, referring to years that have passed.
Hän työskenteli täällä vuosia sitten.
He worked here years ago.
In this context, 'vuosia' emphasizes the duration of time ('years') required to accomplish the action described.