participant
par‧tic‧i‧pant AC /pɑːˈtɪsəpənt, pɑːˈtɪsɪpənt $ pɑːr-/
noun [countable]someone who is taking part in an activity or event
participant in
an active participant in the negotiations
par‧tic‧i‧pant AC /pɑːˈtɪsəpənt, pɑːˈtɪsɪpənt $ pɑːr-/
noun [countable]someone who is taking part in an activity or eventparticipant in