učesnik

1. participant
   Svi učesnici konferencije dobili su sertifikat. — All the conference participants received a certificate.
   Bio je učesnik u saobraćajnoj nesreći. — He was involved in a traffic accident.
2. (in a competition, contest) contestant; entrant
   Učesnici kviza imaju trideset sekundi za odgovor. — Quiz contestants have thirty seconds to answer.

Used with u + loc. (učesnik u ratu) or + gen. (učesnik skupa); the feminine is učesnica; učesnik u saobraćaju means road user.