/ pɑːˈtɪsɪpənt; NAmE pɑːrˈt-/ noun
participant (in sth) a person who is taking part in an activity or event :
He has been an active participant in the discussion.
••
WORD ORIGIN
late Middle English : from Latin participant- , literally sharing in , from the verb participare , based on pars , part- part + capere take.