This is the 742nd most frequent Estonian word.
osalenud
"Osalenud" means "participated" or "taken part" in English.
Here, 'osalenud' is used as the past perfect form of 'osalemine' (participation), indicating action that has been completed prior to now.
Tänases seminaris on osalenud palju huvitavaid inimesi.
Many interesting people have participated in today's seminar.
In this sentence, 'osalenud' connects to an action completed before another event in the past, establishing a past perfect context.
Konverentsi lõpus tunnustati neid, kes olid aktiivselt osalenud.
At the end of the conference, those who had actively participated were recognized.
Here, 'osalenud' reflects an ongoing occasional action in the past that contributes to the person's current characterization.