participant
US /pɑːrˈtɪs.ə.pənt/
UK /pɑːrˈtɪs.ə.pənt/

1.
participante, integrante
a person who takes part in something
:
•
Each participant received a certificate.
Cada participante recebeu um certificado.
•
The survey included over 100 participants.
A pesquisa incluiu mais de 100 participantes.