noun

participant

par-TISS-ih-puhnt/pɑːrˈtɪsɪpənt/

A person who takes part in an activity or event.

The runner joins the other racers as a participant at the starting line.

A runner wearing a plain blank bib stands among others at a community race start, active participant, no numbers or branding.

Etymology

partiLatinpart, share

+cipLatinto take

+antLatinpresent-participle ending

The roots combine the ideas of a part and taking: a participant is someone taking a share. Applied to an activity or event, that share is involvement in what others are doing.

In context

Prolific4:11

So that's all the onboarding step before a participant has ever taken part in a in a study. But this protocol system also continually analyzes participant behavior

AI UK: Prolific CEO Phelim Bradley Q&A - LLM Usage, Quality Checks, and More | Prolific

More examples

The study needs twenty participants to test the new treatment.
As a participant in the discussion, she offers helpful suggestions.
Participants in the race must wear helmets.

Forms

participant · participants

participate verb — To take part in an activity.

participation noun — The act of taking part in something.

Similar words

attendee: Emphasizes being present at an event rather than active involvement.
contestant: Specifically takes part in a competition, often seeking a prize.