This is the 665th most frequent Finnish word.
osallistui
"Participated" or "took part."
In this sentence, 'osallistui' is used in a past tense to indicate participation in an event or organized activity, providing the context of an action that has already occurred.
Hän osallistui kokoukseen aamulla.
He participated in a meeting in the morning.
Here, 'osallistui' describes taking part in a competitive event, emphasizing involvement with a goal or outcome, adding either a sense of conjunction with other actions or importance to the activity.
Opiskelija osallistui kilpailuun, jossa hän voitti palkinnon.
The student took part in the competition where he won a prize.
In this context, 'osallistui' is used to indicate that the subject took part in an event, specifically a marathon.