participant

noun

1. a person or group that participates; partaker.

adjective

2. participating; sharing.

adj.1540s, from Latin participantem (nominative participans), present participle of participare “to share in, partake of,” from particeps “sharing, partaking” (see participation). n.1560s, from Middle French participant, from Latin participantem (nominative participans), present participle of participare “to share in, partake of” from particeps “sharing, partaking” (see participation).