This is the 802nd most frequent Finnish word.
vaikutus
Effect; influence; impact.
Here, "vaikutus" refers to the impact or efficacy of the medicine on alleviating the pain.
Lääkkeellä oli nopea vaikutus kipuun.
The medicine had a quick effect on the pain.
In this case, "vaikutus" represents the influence or impact the teacher had on the students.
Opettajan positiivinen vaikutus oppilaisiin oli merkittävä.
The teacher's positive influence on the students was significant.
Here, "vaikutus" is used to describe the consequences or changes brought about to biodiversity due to climate change.